UIApplication.sharedApplication() is unavailable

Question

I just upgraded from XCode 6.4 to Xcode 7 GM and get started to change the code to be compliant with Swift 2. I could not come over the following errors.

The project

Answer 1

The classes in containing app somehow went in to the compile resources list in the extension Build Phases. I deleted them, it is ok now.

I did not do that. Obviously upgrade to Xcode 7 GM process somehow did it.