XCode: Could not launch “APP_X_Y” - 'A' packet returned an error: -1

Question

I\'m trying to get my App to work again on the simulator as well as on my device. Before I got this error, I went through an odyssee of XCode signing errors, but right know

Answer 1

Got the same error when attempting to deploy an application to the third of three connected devices.

All I had to do was quit XCode and restart it and then it worked fine again.