App installation failed

Question

In Xcode 6 Beta 5, when I attempt to run my app after building, I receive an error dialog that says:

App installation failed

Answer 1

I have had this happen to me about 3 times since moving to Beta 5 and Xcode beta 5. I usually navigate to my Organizer and select Projects. Find your project on the left and delete it. Next I close Xcode and restart both my Mac and my Testing Device! Has helped every time!