xcode 8.3 Could not launch application process launch failed: unspecified

Question

I have new installed Xcode 8.3 with iOS 10.3.

My application ran on iOS as expected and suddenly Xcode fails to run application on device with error:

Could not launch "My app" process launch failed: unspecified

It runs on Simulators and on other device mini-pad (10.2)

Answer 1

I also have this problem when run in iOS 10.3.1 with xcode 8.3.2 Restart device, It will work well

Answer 2

I tried plugging out-in the cable of iOS - doesn't help

I restarted iOS device and Xcode - everything works as expected

(hope it will help to someone)

Answer 3

• Plugged out the device cable.
• delete App.
• restart device.
• Delete Xcode Derive Data
• Quit and launch Xcode again.

Build and run successfully.

Answer 4

I had similar issue. Tried below steps :

1. Quit Xcode (cmd + Q)
2. Clean project (cmd + shift +k)
3. Delete Derived data (cmd + comma)

But these didn’t worked. Instead restarting device worked!