I have idea what happened recently with TestFlight. I have been uploading hundreds of bundles using TestFlight App and Xcode Archives.
With my recen target I get this and i have no idea where does it come from. I do everything the same as with my other apps:
- Archive target with signing it with my AdHos certificate / provisioning profile
- Go to Organizer / Archivers / open in Finder and drop archive to the TestFlight app
- TestFlight app builds IPA and uploads but this time it ends with the same error:

As you can see even on screenshot, I have deployment target specified (minimum). I have also tried to specify minimum ios version in info file as instructed here (even if I believe I shouldn't do it in Info.plist):
https://developer.appcelerator.com/question/150078/invalid-ipa-must-specify-minimumosversiontestfligh

But it did not help.