I am running Xcode 6 and iOS 8 GM. Every other time I run my app I get this message from Xcode:
\"Could not inspect the application package\"
deleting Pods and then calling pod install worked for me
You can try following steps: Window->Projects and look for your project and delete 'Derived Data' for all your projects with the same name
This error seems to happen when you have third party code which isn't signed by you in your bundle. Check this thread, it helped me once.
Also when performing build clean opt for cmd + option + shift + k.
In my case, I needed to check the option that says "Copy only when installing" under "Build Phases/Embed Frameworks" in one of the frameworks I was embedding.
This can happen with Xcode 6 and iOS 8 if a product name contains non-latin characters. In this case changing product name to the one with only latin characters for debug builds fixes this problem.
Change the Display name in Targets > General > Identity
Build your app and switch back to your old name.
It worked for me