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I'm getting the following 2 errors that seem that alternate every time I try to build. I just upgrade my iOS to 12.2 which forced me to upgrade my osx to Mojave 10.14.4 and my xcode to 10.2.

Failed to find or create execution context for description.

Filed to find a suitable device for the type IBSimDeviceTypeiPad2x in Assets.xcassets

This I have tried:

Cleaning Build Folder (repeatedly)

Closing and restarting Xcode and the simulator

Deleting Derived Data

shim
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David Park
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  • [This answer](https://stackoverflow.com/a/56832489/1032372) may help anyone facing a similar problem. – shim Jul 26 '19 at 04:20

3 Answers3

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Run this command in the terminal to make sure all simulator process in the background are killed : 

sudo killall -9 com.apple.CoreSimulator.CoreSimulatorService
ezzou
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  • My MacBook is running 10.15.5. I had been using Xcode 11.5.1, and also had beta 1 of Xcode 12 installed. I upgraded my iPad mini (5th gen) from iPadOS 13.5.1 to 13.6, and upgraded Xcode from 11.5.1 to 11.6. When I went to run a project on the iPad, Xcode gave me that error. Using the "sudo killall" as you suggested fix the problem for me (the next step would have been rebooting). Thanks! – Kenster999 Jul 25 '20 at 18:58
  • this fix worked for me as well, thanks! a reboot likely would have done the same thing, but this is much quicker – Casey Feb 27 '23 at 21:36
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I had faced the same issue my issue resolved by doing:

  • Clean build folder (shift + command + K)
  • Restart your system (Mac)

Note: Also missing simulator after updating to Xcode 10.3 fix by this solution.

shim
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9to5ios
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Well I don't know how many other people this is going to help out but here was my issue:

I poked around and finally got another error that said that my simulator runtime is not available. What ended up solving it was simply restarting my macbook found from this thread: The iOS 8.1 simulator runtime is not available error in Xcode 6.1

David Park
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