Failed to get the task for process
===

I get an error message while running my app on device:

error: failed to launch '/Users/michalsvacha/Library/Developer/Xcode/DerivedData/myApp-fvyxohsnqeujfwcjuqdnvfobusdt/Build/Products/Debug-iphoneos/myApp.app/iSense' -- failed to get the task for process 46681

It didn't happen few days ago. The app starts and minimizes itself(no crash). This message gets logged.

Anybody ever experienced same problem? I searched here, but all the questions dealt with ad-hoc distribution, which is not my case. Other apps work smoothly.