Today I uploaded my first build of first app successfully to App Store for beta testing. After making a few changes, when I tried to submit the new archive again Xcode crash
If that doesn't work, than it could also be that the used Certificate has expired. So check if your Certificate is still valid.
I encountered similar situation. However, my solution was somehow different.
Noticing that you are trying to submit next build, please make sure your previous build is excluded from App Store submit form before uploading new build.
I'm not sure why this has to be an issue, but it seems like that the submit form should be cleared before receiving new build.
Had the same problem - uploaded my .ipa through the Application Loader.
Close any projects or workspace windows you have open in Xcode but leave Organizer window open and re-submit worked for me.
Had the same problem today. Problem turned out I still had the Reveal Framework included in my project. Make sure you don't have any non-public API usage in your archive.
I created an .ipa file using the Export utility in Organizer, then ran Application Loader. Selected the 'Deliver Your App' button. Choose the new created ipa file and the file appeared in iTuneConnect under the pre-release tab as expected for TestFlight distribution.