I have tried the answers from question here but none of them helped :(
I have installed Xcode 7 beta 5 and the debugger will not show values of variables when debugg
I had the same problem. The reason is because I'm using Crashlytics which is a ObjC framework.
Try to remove some of the ObjC frameworks and then shift + cmd + k to clean your project and rebuild it again.
shift + cmd + k
It should work after that.