Thats really annoying. This error happens in a number of different situations. Sometime restarting the Xcode, fixes the problem. If not, follow these steps: Disconnect your device.

  • Delete the app from your device.

  • Quit xcode (Don’t just simply close the window, quit it)

  • Delete derived data folder (~/Library/Developer/Xcode/DerivedData/-gbrvhlvwmpiobxdujegtghggrffp - or something like that)

  • Now start Xcode, connect device and run the project. It should work fine. There it is.