I am getting the following error when trying to run my app using Xcode 7.1 Beta (7B60) with iOS 9.0 GM installed on my iPad:
An error was encountered whi
You need to run iOS 9.1 beta together with Xcode 7.1 beta. Using a GM iOS and a beta Xcode together leads to this kind of problems.
I'd suggest to simply use Xcode 7.0 GM with your installed version of iOS.