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.
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Delete the app from your device.
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Quit xcode (Don’t just simply close the window, quit it)
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Delete derived data folder (~/Library/Developer/Xcode/DerivedData/-gbrvhlvwmpiobxdujegtghggrffp - or something like that)
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Now start Xcode, connect device and run the project. It should work fine. There it is.
