Error ITMS-4236 when uploading build to iTunes because of build version

Question

I was trying to upload a pre-release build to iTunes to use it with the new iTunes TestFlight integration.

The way I have my continuous integration builds setup is that

Answer 1

iTunesConnect doesn't allow letters in the version numbers. I don't know if this is new with the TestFlight integration or if it's been like that for a while.

We used to use letters in our version numbers to denote internal builds. Guess we aren't anymore.