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

Problem: Few times, if you add app extension where you have file and info plist, extension's file and plist are assigned to target, is wrong causes issue rises. Solution: Extension's all file should be assigned in App Extensions target, and info plist should not be assigned to any target.