Xcode iOS organizer submit to app store yields “The archive is invalid” error

Question

I just switched from Xcode 3 to 4. When I attempt to upload an app that I have archived to the organizer, I receive this error:

The archive is invalid

Answer 1

Had this error in Xcode, but had no such error when using the Application Loader. Get to it via Xcode -> Open Developer Tool -> Application Loader. Very frustrating indeed.