I try to upload an update for my app. However I always get this error message:

I use xcode 4.2 and the iOS 5.0 SDK. I read that question Xcode iOS organizer submit to app store yields "The archive is invalid" error but nothing helped.
I tried following
- uninstall xcode using command line and reinstall it
- delete all distribution proviles and create new
- opened the project file in text editor removed all provisioning lines
and code sign lines, clean and build
I keep getting this error message. Any ideas?
I was using Xcode 4.2 beta which cannot submit valid applications to the appstore, since it is beta. I rolled back to xcode 4 and was able to upload my build.