I have tried do submit an application via Xcode (as well as the application loader) to the Apple store, and I received the following error:
Invalid Bu
I know this is a rather old post, but I ran into this issue and this is how I fixed it:
I believe this is what fixed the problem, but there is one other change that may have had an effect.
At one point, I had turned off 'Parallelize Build" in my active Scheme. I had since turned it back on, but perhaps it left some artifacts. I doubt this had any connection, but just in case, I went to my build folders and deleted the files inside before I cleaned and built.
I hope this can help someone who runs into this issue.