`react-native run-ios` returns Error: Could not find iPhone X simulator

Question

whenever I run react-native run-ios, I get

Could not find iPhone X simulator

Error: Could not find iPhone X simulator
    at resolve (calendarPractice/node_modules/react-native/local-cli/runIOS/runIOS.js:149:13)
    at new Promise (<anonymous>)
    at runOnSimulator (calendarPractice/node_modules/react-native/local-cli/runIOS/runIOS.js:134:10)
    at Object.runIOS [as func] (calendarPractice/node_modules/react-native/local-cli/runIOS/runIOS.js:106:12)
    at Promise.resolve.then (calendarPractice/node_modules/react-native/local-cli/cliEntry.js:117:22)

however, when I run on Xcode, it works fine

{
  "devicetypes" : [
    {
      "name" : "iPhone 4s",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPhone 4s.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPhone-4s"
    },
    {
      "name" : "iPhone 5",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPhone 5.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPhone-5"
    },
    {
      "name" : "iPhone 5s",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPhone 5s.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPhone-5s"
    },
    {
      "name" : "iPhone 6",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPhone 6.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPhone-6"
    },
    {
      "name" : "iPhone 6 Plus",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPhone 6 Plus.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPhone-6-Plus"
    },
    {
      "name" : "iPhone 6s",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPhone 6s.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPhone-6s"
    },
    {
      "name" : "iPhone 6s Plus",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPhone 6s Plus.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPhone-6s-Plus"
    },
    {
      "name" : "iPhone 7",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPhone 7.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPhone-7"
    },
    {
      "name" : "iPhone 7 Plus",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPhone 7 Plus.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPhone-7-Plus"
    },
    {
      "name" : "iPhone 8",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPhone 8.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPhone-8"
    },
    {
      "name" : "iPhone 8 Plus",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPhone 8 Plus.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPhone-8-Plus"
    },
    {
      "name" : "iPhone SE",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPhone SE.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPhone-SE"
    },
    {
      "name" : "iPhone X",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPhone X.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPhone-X"
    },
    {
      "name" : "iPhone Xs",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPhone Xs.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPhone-XS"
    },
    {
      "name" : "iPhone Xs Max",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPhone Xs Max.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPhone-XS-Max"
    },
    {
      "name" : "iPhone Xʀ",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPhone Xʀ.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPhone-XR"
    },
    {
      "name" : "iPad 2",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPad 2.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPad-2"
    },
    {
      "name" : "iPad Retina",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPad Retina.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPad-Retina"
    },
    {
      "name" : "iPad Air",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPad Air.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPad-Air"
    },
    {
      "name" : "iPad Air 2",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPad Air 2.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPad-Air-2"
    },
    {
      "name" : "iPad (5th generation)",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPad (5th generation).simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPad--5th-generation-"
    },
    {
      "name" : "iPad Pro (9.7-inch)",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPad Pro (9.7-inch).simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPad-Pro--9-7-inch-"
    },
    {
      "name" : "iPad Pro (12.9-inch)",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPad Pro (12.9-inch).simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPad-Pro"
    },
    {
      "name" : "iPad Pro (12.9-inch) (2nd generation)",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPad Pro (12.9-inch) (2nd generation).simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPad-Pro--12-9-inch---2nd-generation-"
    },
    {
      "name" : "iPad Pro (10.5-inch)",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPad Pro (10.5-inch).simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPad-Pro--10-5-inch-"
    },
    {
      "name" : "iPad (6th generation)",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPad (6th generation).simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPad--6th-generation-"
    },
    {
      "name" : "iPad Pro (11-inch)",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPad Pro (11-inch).simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPad-Pro--11-inch-"
    },
    {
      "name" : "iPad Pro (12.9-inch) (3rd generation)",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/iPad Pro (12.9-inch) (3rd generation).simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.iPad-Pro--12-9-inch---3rd-generation-"
    },
    {
      "name" : "Apple TV",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/AppleTVOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/Apple TV.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.Apple-TV-1080p"
    },
    {
      "name" : "Apple TV 4K",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/AppleTVOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/Apple TV 4K.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.Apple-TV-4K-4K"
    },
    {
      "name" : "Apple TV 4K (at 1080p)",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/AppleTVOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/Apple TV 4K (at 1080p).simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.Apple-TV-4K-1080p"
    },
    {
      "name" : "Apple Watch - 38mm",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/WatchOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/Apple Watch - 38mm.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.Apple-Watch-38mm"
    },
    {
      "name" : "Apple Watch - 42mm",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/WatchOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/Apple Watch - 42mm.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.Apple-Watch-42mm"
    },
    {
      "name" : "Apple Watch Series 2 - 38mm",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/WatchOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/Apple Watch Series 2 - 38mm.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-2-38mm"
    },
    {
      "name" : "Apple Watch Series 2 - 42mm",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/WatchOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/Apple Watch Series 2 - 42mm.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-2-42mm"
    },
    {
      "name" : "Apple Watch Series 3 - 38mm",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/WatchOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/Apple Watch Series 3 - 38mm.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-3-38mm"
    },
    {
      "name" : "Apple Watch Series 3 - 42mm",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/WatchOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/Apple Watch Series 3 - 42mm.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-3-42mm"
    },
    {
      "name" : "Apple Watch Series 4 - 40mm",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/WatchOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/Apple Watch Series 4 - 40mm.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-4-40mm"
    },
    {
      "name" : "Apple Watch Series 4 - 44mm",
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/WatchOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/DeviceTypes\/Apple Watch Series 4 - 44mm.simdevicetype",
      "identifier" : "com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-4-44mm"
    }
  ],
  "runtimes" : [
    {
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/Runtimes\/iOS.simruntime",
      "availabilityError" : "",
      "buildversion" : "16B91",
      "availability" : "(available)",
      "isAvailable" : true,
      "identifier" : "com.apple.CoreSimulator.SimRuntime.iOS-12-1",
      "version" : "12.1",
      "name" : "iOS 12.1"
    },
    {
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/AppleTVOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/Runtimes\/tvOS.simruntime",
      "availabilityError" : "",
      "buildversion" : "16J602",
      "availability" : "(available)",
      "isAvailable" : true,
      "identifier" : "com.apple.CoreSimulator.SimRuntime.tvOS-12-1",
      "version" : "12.1",
      "name" : "tvOS 12.1"
    },
    {
      "bundlePath" : "\/Applications\/Xcode.app\/Contents\/Developer\/Platforms\/WatchOS.platform\/Developer\/Library\/CoreSimulator\/Profiles\/Runtimes\/watchOS.simruntime",
      "availabilityError" : "",
      "buildversion" : "16R591",
      "availability" : "(available)",
      "isAvailable" : true,
      "identifier" : "com.apple.CoreSimulator.SimRuntime.watchOS-5-1",
      "version" : "5.1",
      "name" : "watchOS 5.1"
    }
  ],
  "devices" : {
    "com.apple.CoreSimulator.SimRuntime.watchOS-5-1" : [
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "Apple Watch Series 2 - 38mm",
        "udid" : "01AFDEF7-63B6-465C-A02A-44EE4A07EABA",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "Apple Watch Series 2 - 42mm",
        "udid" : "BE62C985-DEE2-46EC-8962-A582D537EEE0",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "Apple Watch Series 3 - 38mm",
        "udid" : "078BF157-30FA-41D1-94FA-6B1686E03085",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "Apple Watch Series 3 - 42mm",
        "udid" : "E4CE652E-0185-4C59-B965-BED5FCEE7C76",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "Apple Watch Series 4 - 40mm",
        "udid" : "6621323A-A9DE-4BCB-AC97-54C8C33B0158",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "Apple Watch Series 4 - 44mm",
        "udid" : "D89037A3-66A0-43C1-90BA-E7C76CA0D724",
        "availabilityError" : ""
      }
    ],
    "com.apple.CoreSimulator.SimRuntime.tvOS-12-1" : [
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "Apple TV",
        "udid" : "AFAA21B8-BD4A-45EA-B0FF-E9915FE9B926",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "Apple TV 4K",
        "udid" : "EBB88F2E-CFFE-4981-A736-7A7C0B85643D",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "Apple TV 4K (at 1080p)",
        "udid" : "F0B73E8A-986E-447E-B37A-2F46096DEFF6",
        "availabilityError" : ""
      }
    ],
    "com.apple.CoreSimulator.SimRuntime.iOS-12-1" : [
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPhone 5s",
        "udid" : "F870B7FA-6DDA-4336-89AD-68A402844188",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPhone 5s",
        "udid" : "6627ADE5-F8C1-4AE5-BD6F-3AEDDC0B7B63",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPhone 6",
        "udid" : "05574997-ACAD-40CA-A3D7-5624D53F00FA",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPhone 6 Plus",
        "udid" : "93237078-CA6D-4F97-93F9-779809700018",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPhone 6s",
        "udid" : "9B50FE18-4F49-4EA4-80F0-DF498A667D33",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPhone 6s Plus",
        "udid" : "D4640B6D-97DC-4CA1-BE63-C5403159A3D4",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPhone 7",
        "udid" : "6E9EEC00-3291-42B4-B04A-BA3487F9CD5F",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPhone 7 Plus",
        "udid" : "6DA1C3CF-1D1F-4DEF-9B74-2C40D5FB5881",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPhone 8",
        "udid" : "E19386B9-469A-450B-9CD2-B4FE8687DCF9",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPhone 8 Plus",
        "udid" : "6D36DF76-8ED9-41A2-9E1A-0BA48B92C26E",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPhone SE",
        "udid" : "EE4818DF-F817-4441-8A1C-BE1B99303E10",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPhone X",
        "udid" : "85B78A8F-C32B-4493-BDD1-65ECA3F77C86",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPhone X",
        "udid" : "CA12C337-4F66-4C6C-ACE5-7F7EACCBC39A",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPhone XS",
        "udid" : "8BBCE315-2F4C-4132-8E53-28AF52401C8E",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPhone XS Max",
        "udid" : "4E77C62F-AB1F-4EDE-839B-53F70CAFC79E",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPhone XR",
        "udid" : "28D12ABE-3355-4862-960A-0FE5FFE41C7B",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPad Air",
        "udid" : "94485C88-BCEB-456A-95DC-5F8C3DA8D181",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPad Air 2",
        "udid" : "CF2C787D-A378-4AB9-B334-F7B24E94AF4D",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPad (5th generation)",
        "udid" : "DFE602A5-EC68-4585-8AB0-C045A9843D29",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPad Pro (9.7-inch)",
        "udid" : "5A3F3EAC-F788-49F1-A753-5D34A9990F0B",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPad Pro (12.9-inch)",
        "udid" : "EF6EBE34-0A85-4FF0-8A45-7BA418A0CC0C",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPad Pro (12.9-inch) (2nd generation)",
        "udid" : "FBA940F8-FD85-4D5E-A570-EB4F3A56E1F9",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPad Pro (10.5-inch)",
        "udid" : "8AE4AAED-ECE0-4984-9679-8D3022064692",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPad (6th generation)",
        "udid" : "1121363D-EF49-4AC0-9E46-5C30318A24A2",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPad Pro (11-inch)",
        "udid" : "038FECC0-8711-46E3-B601-8F88F2F4AD7D",
        "availabilityError" : ""
      },
      {
        "availability" : "(available)",
        "state" : "Shutdown",
        "isAvailable" : true,
        "name" : "iPad Pro (12.9-inch) (3rd generation)",
        "udid" : "12DC911F-2F45-4767-BC1A-6F1D0C8D9F3D",
        "availabilityError" : ""
      }
    ]
  },
  "pairs" : {
    "C9B69F4A-6A9D-44F3-A6BC-56BFA2F8B83F" : {
      "watch" : {
        "name" : "Apple Watch Series 4 - 44mm",
        "udid" : "D89037A3-66A0-43C1-90BA-E7C76CA0D724",
        "state" : "Shutdown"
      },
      "phone" : {
        "name" : "iPhone XS Max",
        "udid" : "4E77C62F-AB1F-4EDE-839B-53F70CAFC79E",
        "state" : "Shutdown"
      },
      "state" : "(active, disconnected)"
    },
    "5327B65F-29E7-42D0-9861-FF31428F3218" : {
      "watch" : {
        "name" : "Apple Watch Series 4 - 40mm",
        "udid" : "6621323A-A9DE-4BCB-AC97-54C8C33B0158",
        "state" : "Shutdown"
      },
      "phone" : {
        "name" : "iPhone XS",
        "udid" : "8BBCE315-2F4C-4132-8E53-28AF52401C8E",
        "state" : "Shutdown"
      },
      "state" : "(active, disconnected)"
    }
  }

which version react-native do you use? because some version of react-native has an issue related this problem — sdkcy, Feb 04 '19 at 10:25
npmPackages: react: 16.6.3 => 16.6.3 react-native: ^0.58.3 => 0.58.3 — Seongmin Choo, Feb 04 '19 at 10:37
Could you check in node_modules/react-native/local-cli/runIOS/findMatchingSimulator.js, is there this snippet `if ( simulator.availability !== '(available)' && simulator.isAvailable !== 'YES' ) { continue; }` — sdkcy, Feb 04 '19 at 10:47
could you run this command `xcrun simctl list --json` on your terminal and add the result to your question? So we can understand what is it going on? — sdkcy, Feb 05 '19 at 08:54
I answered, because it is long for comment. Please try and let me know. — sdkcy, Feb 05 '19 at 09:46
Easy and fast way to resolve this issue by below script. https://stackoverflow.com/a/56920807/706888 — omprakash8080, Jul 07 '19 at 09:27

Weisheng Wu · Answer 1 · 2020-07-23T01:30:50.060

118

To fix this error, simply reinstall project & node modules using npm

npm install

Then it will show a list of warnings, and to fix them use the following command:

npm audit fix

This should fix everything, and allow you to run iOS emulator react-native run-ios

edited Jul 23 '20 at 01:30

answered Mar 29 '19 at 06:08

Weisheng Wu

1,381
2
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4

Its nothing to do with npm as it will just install or audit node modules – Firdous nath Mar 29 '19 at 06:10
19

This fixed it for me... without doing the accepted answer. Thanks! – RiddlerDev Apr 04 '19 at 12:22
2

@Firu And yet there are at least three of us now for which this was the fix. – Rob Osborne Apr 04 '19 at 18:12
3

this didn't work for me. `react-native --version` -> `react-native-cli: 2.0.1 react-native: 0.57.7` `react-native info` -> `macOS 10.14.4 Platforms: iOS 12.2 Xcode: 10.2/10E125` – Gianfranco P. Apr 05 '19 at 14:00
1

This worked for me too.. Too early. It opens up emulator but application building fails :| – helloworld Apr 15 '19 at 14:04
1

Worked for me too. – Dombi Soma Apr 16 '19 at 20:16
4

imho this should be the right answer. Changing `node_modules` files should not be a valid answer. It will come back to bite you when you trash `node_modules` folder for any reason. – Bathan May 03 '19 at 14:48
1

Worked for me.Thanks. – Emon May 14 '19 at 17:38
I'm glad it worked for you all. Just to clarify, I mean first step : npm install is using npm to reinstall the node modules, not reinstall npm. My apologies on the typo. – Weisheng Wu May 17 '19 at 21:45
`npm audit fix`changes my react-native version to 0.59.8 from 0.57.5. Is this the solution or side affect? – levye May 31 '19 at 13:54
@levye side effect, really troublesome by the way. – KlimczakM Jul 10 '19 at 12:32
1

Worked, thanks!. My guess is this problem occurs when attempting to run older React Native projects. – Max MacLeod Nov 28 '19 at 14:00
Is there a way to do this with yarn? – Shane Sepac May 04 '21 at 17:17

score 109 · Accepted Answer · edited Apr 14 '19 at 19:18

109

Edited: I copied your devices section of your output JSON and embedded to my own /node_modules/react-native/local-cli/runIOS/runIOS.js

function runOnSimulator(xcodeProject, args, scheme) {
return new Promise(resolve => {
    try {
        var simulators = {devices section of your json}; //Here
    } catch (e) {
        console.log("e", e);
        throw new Error('Could not parse the simulator list output');
    }

    const selectedSimulator = findMatchingSimulator(simulators, args.simulator);
    console.log("selected", selectedSimulator);
    if (!selectedSimulator) {
        throw new Error(`Could not find ${args.simulator} simulator`);
    }
    ...

And finally, it gave the same error as yours. So I figured out that parsing version of devices different. In your devices, version is;

"com.apple.CoreSimulator.SimRuntime.tvOS-12-1" //for tvOS
"com.apple.CoreSimulator.SimRuntime.iOS-12-1" // for iOS

but in react-native checks this version values like this(/node_modules/react-native/local-cli/runIOS/findMatchingSimulator.js);

// Making sure the version of the simulator is an iOS or tvOS (Removes Apple Watch, etc)
if (!version.startsWith('iOS') && !version.startsWith('tvOS')) {
    continue;
}

So react-native can not recognize.
If we change this code with this;

// Making sure the version of the simulator is an iOS or tvOS (Removes Apple Watch, etc)
if (!version.startsWith('com.apple.CoreSimulator.SimRuntime.iOS') && !version.startsWith('com.apple.CoreSimulator.SimRuntime.tvOS')) {
    continue;
}

the problem was solved. I checked that with your JSON data in my computer and it worked.

edited Apr 14 '19 at 19:18

answered Feb 05 '19 at 09:45

sdkcy

3,528
1
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24

Hate that this worked - anyone have a more permanent solution? – Kevin Grant Mar 26 '19 at 20:47
Same problem here. Is there any permanent solution to avoid nom install backroll. Downgrade to xcode 10.0? – Patrik Rikama-Hinnenberg Mar 27 '19 at 16:54
2

In case anyone was running iPhone XR specifically (ie. `react-native run-ios --simulator='iPhone XR'`), use the following, `react-native run-ios --simulator='iPhone Xʀ'`. Using a lowercase r will not work. – Mix Master Mike Apr 02 '19 at 02:17
4

The longer term fix is to await the next release of `react-native-cli`, where this is fixed https://github.com/react-native-community/react-native-cli/pull/274 – wbharding Apr 03 '19 at 19:19
Permanent solution for this issue? For me it works to upgrade RN to 0.58.6 – Augusto Gonzalez May 17 '19 at 22:56
4

How is this the answer?!?!?!?! you don't mess with plugins like that – arled Jun 04 '19 at 10:12
2

This doesn't work anymore. runIOS folder isn't on react-native folder in node_modules as of today. Any other fix? – Akio Sep 21 '19 at 04:01
@MixMasterMike i run your command but in every time just iPhone x launch :( – Oliver D Feb 10 '20 at 08:26
@MixMasterMike you can run any installed simulator with that command `react-native run-ios --simulator="iPhone SE"`. For example that command will run iPhone SE simulator, which is installed on Xcode. – sdkcy Feb 10 '20 at 12:07
@OliverD unfortunately, I haven't touched my RN project since posting my comment. But did you happen to copy and paste the 2nd code? The one with the small capital R. – Mix Master Mike Feb 11 '20 at 17:58
@sdkcy yup, that's the idea. the key is to know the exact model you're trying to target as stated [here](https://facebook.github.io/react-native/docs/running-on-simulator-ios). – Mix Master Mike Feb 11 '20 at 18:04

JC Lango · Answer 3 · 2019-11-26T19:19:50.190

PROBLEM

If you try this with the latest Xcode (11), there is no iPhone X!

Run Simulator by itself, in the top menu, look under Hardware, Device, iOS 13.0. You will see there is:

iPhone 8
iPhone 8 Plus
iPhone XS
iPhone XS Max
iPhone XR
... and some iPads

When you execute run-ios, react-native is designed to match a requested device.

The internally hard coded default is iPhone X.

The function that tries to match the requested device is in:

/node_modules/@react-native-community/cli-platform-ios/build/commands/runIOS/findMatchingSimulator.js

This function is designed so you can give it a device, and an optional version number.

If the given device and version cannot be found, it will return a match using the first device in the list by default.

But... in reality, the first device is a watch, and any watch is excluded from matching, so this function will return null.

SOLUTION 1 - Use an existing Xcode device

Run Simulator first by itself, as described above, and make a note of which iPhone or iPad you want.

Then pass this name as an optional argument the the run-ios command line command as follows:

react-native run-ios --simulator="iPhone 8"

SOLUTION 2 - Add New Xcode iOS Device

According to Xcode 11 Release Notes:

"Xcode no longer creates every available iOS simulator device by default. Instead a set of the most commonly used devices are created. To create other devices — or multiple instances of a device — open the Devices window, select Simulators, click the + button, enter a name, and select the relevant device type and OS version. In Terminal, execute the xcrun simctl create command, for example xcrun simctl create "My iPhone 7" "iPhone 7" iOS13.0. (49428617)"

In Xcode, you need to add a new device called "iPhone X".

Also I answered here: React Native Issue #2328

Thanks a lot, you saved the day. Instead of manually configuring the changes this is the easiest and by far the most accurate solution in case of ios 13+. Personally this should be tagged as the accepted answer. — Parth Manaktala, Sep 15 '19 at 18:12
this should be the accepted answer, along with a quick explanation of how to change the RN default from iPhone X — nosequeldeebee, Sep 21 '19 at 16:29
iOS 13.0 simulators now doesn't include every available devices except for the most used one, you need to manually create them if you want other devices (e.g iPhone 7, iPhone X). Reference is here: https://developer.apple.com/documentation/xcode_release_notes/xcode_11_release_notes — Akio, Sep 22 '19 at 09:10
I simply added an iPhone X to the list of available devices directly in XCode. Now it can be found! — bergjs, Sep 25 '19 at 20:23
Yes, this is the actual reason, do not try to edit any files. Thanks a lot. — Kampai, Oct 10 '19 at 09:07

orberkov · Answer 4 · 2019-04-14T03:21:33.923

Temporary fix:

Step 1: Open the file /node_modules/react-native/local-cli/runIOS/findMatchingSimulator.js

Step 2: Change a line of code, from this:

if (!version.startsWith('iOS') && !version.startsWith('tvOS')) {
  continue;
}

to this:

if (!version.startsWith('com.apple.CoreSimulator.SimRuntime.iOS') && !version.startsWith('com.apple.CoreSimulator.SimRuntime.tvOS')) {
  continue;
}

Step 3: Run react-native run-ios (you might need to run it twice, and don't forget to kill the Metro Bundler [the console that's running in the background] if it's running from your previous unsuccessful build!)

The problem was that after an update to Xcode - the simulator namespaces were added to the devices' versions list. The React Native build wasn't expecting these namespaces - hence the build break.

Run `react-native run-ios` with `--verbose` flag. It will indicate the file where the logic above is located. — Grzegorz Pawlik, Aug 24 '20 at 10:37

score 37 · Answer 5 · answered Jun 05 '19 at 12:44

37

after update to Xcode 11 xcrun returns true or false and not YES or NO as before.

goto /node_modules/react-native/local-cli/runIOS/findMatchingSimulator.js and in

find

if (
   simulator.availability !== '(available)' &&
   simulator.isAvailable !== 'YES'
 ) {
  continue;
}

and change it to

if (
   simulator.availability !== '(available)' &&
   simulator.isAvailable !== true
 ) {
  continue;
}

answered Jun 05 '19 at 12:44

David Chelidze

1,143
12
19

3

This worked for me as well. Found it different directory. node_modules/@react-native-community/cli/build/commands/runIOS/findMatchingSimulator.js – user781404 Jun 11 '19 at 20:42
1

They changed it again (wtf) ```/node_modules/@react-native-community/cli-platform-ios/build/commands/runIOS/findMatchingSimulator.js``` – Oliver Dixon Jul 25 '19 at 08:22
I couldn't find (wtf) – Forhad Oct 05 '19 at 08:21
too bad. Same thing here. In earlier versions of XCode, I had to change the `version.startsWith` to `version.includes`, which has been fixed. Now, a couple of lines further down, change 'YES' to true… A never ending story – cokron Nov 18 '19 at 10:17
had to change it in the community package, worked, thanks – matt93 Dec 16 '19 at 12:34

score 34 · Answer 6 · answered Sep 25 '19 at 13:38

There is no iPhone X simulator on your machine, most probably because you updated Xcode. You can simply pass the name of the available simulator like below:

react-native run-ios --simulator="iPhone 11"

For checking available simulators you can open Xcode and check on device list as shown below:

score 10 · Answer 7 · answered May 14 '19 at 06:36

10

Open the file /node_modules/react-native/local-cli/runIOS/findMatchingSimulator.js

!version.startsWith('iOS') - > !version.includes('iOS')

answered May 14 '19 at 06:36

Melih Sevim

930
6
9

score 9 · Answer 8 · edited Sep 27 '19 at 05:10

9

I also did not have iPhone X installed as a simulator on Xcode. All I had to do was add the iPhone X as a new simulator in Xcode and all is well.

In Xcode: Go to Window then Devices and Simulators. Click the simulators tab. Click the + button on the bottom left corner and add the iPhone X.

I hope this fix is as easy for you as it was for me.

edited Sep 27 '19 at 05:10

alxlives

5,084
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50

answered Sep 26 '19 at 17:35

Rose

91
1
3

It's as easy as this, at least for me. – Chris Sep 30 '19 at 08:33

score 9 · Answer 9 · edited Oct 25 '19 at 07:42

9

After I updated Xcode to version 11, I encountered the same problem.

A solution can be to add the iPhone X simulator into your list.

Choose simulator -> Hardware -> Manage Devices (you will see a popup)
Choose "Simulators" -> (left bottom corner) +(the plus icon, next to "Filter") then add a new simulator,
Simulator Name: iPhone X Device Type: Choose iPhone X.

It worked for me

edited Oct 25 '19 at 07:42

Al Foиce ѫ

4,195
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answered Oct 25 '19 at 07:12

Radu Cimpian

91
1
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1

This is the proper 2019 solution – sospedra Oct 30 '19 at 09:54
Definitely the way to go. Ran into 2 small issues tho: 1- Had to pair my new "iPhone X" simulator with an iOS 12.4 runtime 2- Had to replace `simulator.isAvailable !== 'YES'` with `simulator.isAvailable !== true` in `node_modules/@react-native-community/cli/build/commands/runIOS/findMatchingSimulator.js` – eightyfive Nov 01 '19 at 05:58

score 7 · Answer 10 · edited Feb 04 '20 at 21:08

7

I encountered the same error when i upgraded my Xcode 10 to Xcode 11, But specifying the simulator version happens to be a quick fix for me.

First list all available ios emulator with

  xcrun simctl list devices | grep iPhone | grep -v unavailable | cut -d'(' -f1

Result

Then select one to run react-native with, e.g

 react-native run-ios --simulator='iPhone 11 Pro Max'

edited Feb 04 '20 at 21:08

Ajeett

814
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answered Oct 19 '19 at 12:42

samtax01

834
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11

this should work I think but did not for me, I tried with the relevant simulator open and closed – Harry Moreno Oct 31 '19 at 17:17

score 6 · Answer 11 · answered Nov 05 '19 at 09:02

For Xcode 11.2 and iOS 13.2 here are changes i've done to run the app in simulator

in findMatchingSimulator.js

line 43:

if (!version.startsWith('iOS') && !version.startsWith('tvOS')) {

to

if (!version.includes('iOS') && !version.includes('tvOS')) {

line

line 52

if (
    simulator.availability !== '(available)' &&
    simulator.isAvailable !== 'YES'
  ) {
    continue;
  }

to

if (
    simulator.isAvailable != true
  ) {
    continue;
  }

P.S.

First day on React project ad already lowing it! (no)

score 5 · Answer 12 · answered May 18 '19 at 02:35

5

in my case i run the script: sed -i '' 's/startsWith/includes/g' node_modules/react-native/local-cli/runIOS/findMatchingSimulator.js and it worked. also suitable for people who can't update react-native

answered May 18 '19 at 02:35

Omar Soufiane

183
2
3

ricardo · Answer 13 · 2019-10-18T17:26:17.203

5

My problem was that iPhone X simulator was not installed

You can check what simulators are installed with

xcrun simctl list devices | grep iPhone | grep -v unavailable | cut -d'(' -f1

Then run

react-native run-ios --simulator="iPhone Xs"

edited Oct 18 '19 at 17:26

answered Jul 09 '19 at 20:33

ricardo

1,221
2
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score 3 · Answer 14 · answered Sep 22 '19 at 07:26

3

easy fix...

Xcode -> preferences -> components install ios 12.2 sumulator

answered Sep 22 '19 at 07:26

velvetInk

368
1
4
18

@velvetlnk - mine only goes up as far as – Andrew Newby Oct 04 '19 at 12:58
install any ios versions below 13 – velvetInk Oct 11 '19 at 19:42

kaushal · Answer 15 · 2019-06-17T07:41:11.847

if could not found simulator still persists after replacing following lines of code in runSimulator.js.

Path for runSimulator.js -> /node_modules/react-native/local-cli/runIOS/findMatchingSimulator.js

if (!version.startsWith('iOS') && !version.startsWith('tvOS')) { continue; }

with this one

if ( !version.startsWith('com.apple.CoreSimulator.SimRuntime.iOS') && !version.startsWith('com.apple.CoreSimulator.SimRuntime.tvOS') ) { continue; }

comment following lines after replacing

if ( simulator.availability !== '(available)' && simulator.isAvailable !== 'YES' ) { continue; }

It will launch iPhone simulator without any issue.

and 2nd approach after updating to XCode 11

Xcode 11 xcrun returns true or false and not YES or NO for isAvailable property as before. You can check that using the following command

xcrun simctl list devices --json

above command will print all available devices like following

"com.apple.CoreSimulator.SimRuntime.iOS-12-2" : [
  {
    "state" : "Booted",
    "isAvailable" : true,
    "name" : "iPhone X",
    "udid" : "E53748D1-628B-4A99-A419-4D7AE7CE4745"
  }
]

Replace YES with true in following code

if ( simulator.availability !== '(available)' && simulator.isAvailable !== 'YES' ) { continue; }

like this

if ( simulator.availability !== '(available)' && simulator.isAvailable !== true ) { continue; }

Yes, that's what my issue was that after update to xcode 11 i started getting this error. replacing 'YES' with true did the job. — Sudhir, Sep 30 '19 at 11:38

score 2 · Answer 16 · answered Oct 04 '19 at 11:20

change /node_modules/@react-native-community/cli-platform-ios/build/commands/runIOS/index.js

file

options: [{
    name: '--simulator [string]',
    description: 'Explicitly set simulator to use. Optionally include iOS version between' + 'parenthesis at the end to match an exact version: "iPhone 6 (10.0)"',
    default: 'iPhone X'
  }

to

options: [{
    name: '--simulator [string]',
    description: 'Explicitly set simulator to use. Optionally include iOS version between' + 'parenthesis at the end to match an exact version: "iPhone 6 (10.0)"',
    default: 'iPhone 8'
  }

score 2 · Answer 17 · answered Feb 29 '20 at 07:06

I encountered this issue after trying to upgrade React Native from 0.59.8 to 0.59.9.

It turns out (based the above answers), we need to update @react-native-community/cli module:

Remove it from lockfile (yarn.lock or package-lock.json)
Run yarn or npm install to install it again.

reference: https://github.com/react-native-community/rn-diff-purge/issues/21#issuecomment-507645945

score 1 · Answer 18 · answered Jul 13 '19 at 17:40

With react-native-cli 2.0.1, you may want to just rename your simulator. By default Xcode will name some devices in the format <DeviceName> (<DeviceSize>). However this version of the CLI interprets anything in parentheses as the iOS version.

When trying to run a simulator named iPad Pro (10.5-inch), I was able to get it to run by simply renaming the simulator to iPad Pro [10.5-inch].

You can rename simulators by using the Simulator app's Hardware->Device->Manage Devices... menu, and right-clicking one of your simulators (in Xcode 10.2.1)

score 1 · Answer 19 · answered Jul 23 '19 at 11:23

1

I faced the issue when I updated Xcode. All the simulators were not available/uninstalled. I am installing them again.

answered Jul 23 '19 at 11:23

rajeswari ratala

650
7
14

score 1 · Answer 20 · answered Nov 07 '19 at 08:49

1

In my case, i have tried others above solution but nothing worked.

Then i try upgrading react-native from 0.59.5 to 0.59.10 then it's solved

answered Nov 07 '19 at 08:49

raosan

11
1

After trying everything I changes the version from `0.59.5` to `0.59.10` and it resolved the issue, great great advice :) – Manoj Sehrawat Apr 06 '20 at 07:13

score 1 · Answer 21 · answered May 04 '21 at 17:39

What fixed it for me was not having Xcode command lines tools set (xcrun simctl was failing.) If you just re-installed Xcode, you might have this issue.

See this post on how to set the command line tools. After, try running react-native run-ios --simulator="iPhone 11" (or whatever your simulator name is).

score 1 · Answer 22 · answered Dec 01 '22 at 17:36

In my case the problem was that after an xcode update the simulator got removed and I had to create it manually (as this new xcode Version did not had it as a default)

You could check if it is as device listed here:

xcrun simctl list devices

If it's under the "Unavailable" title (because you're missing the iOS version), you can create one with you current version, or download the expected runtime.

For that go to XCode->Window->Devices and Simulators and hit on the plus button, to create your simulator with model an iOS version as depicted here:

That solved my problem.

score 0 · Answer 23 · answered Nov 12 '19 at 20:03

0

For me, I had to update React Native to 0.60 by running npx react-native-git-upgrade.

answered Nov 12 '19 at 20:03

Ryan Kane

51
6

score 0 · Answer 24 · answered Oct 15 '20 at 10:41

0

I had the same problem

npm audit fix

this worked for me

answered Oct 15 '20 at 10:41

Mr Abbasi

97
11

Worked in this answer too: https://stackoverflow.com/a/55411403/4294399 – General Grievance Oct 15 '20 at 12:00

score -1 · Answer 25 · answered Aug 21 '19 at 15:13

-1

I'm having the same issue each time I update Xcode.
I run this command:

sudo killall -9 com.apple.CoreSimulator.CoreSimulatorService

Then I run react-native run-ios again.

answered Aug 21 '19 at 15:13

Erik Rybalkin

1,143
12
21

score -4 · Answer 26 · answered Jul 24 '19 at 11:20

-4

Just reboot your computer and run command again.

answered Jul 24 '19 at 11:20

Vladimir Jovanovic

141
1
10

`react-native run-ios` returns Error: Could not find iPhone X simulator

26 Answers26

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