I upgraded Xcode to version 7.2 (7C68).
After the upgrade I can no longer install the project under development for testing on my iPad.
This message appears:
App installation failed: An unknown error has occurred
I've tried to give a clean, but to no avail.
In a simulator the project is installed normally.
For testing purposes I've created a new project and it's installed on both the simulator and the iPad.
Do you have any logs in Xcode to try to find the problem?