Also having this issue!

I'm having same issue when converting a kivy application to iOS. When I try to distribute via the "Ad Hoc" option, it pops up with this error before I can select anything. "The operation couldn’t be completed. (AppThinning.StubError error 1.)" if I submit it through App Store connect, it uploads, but 10 minutes later or so I get the email mentioned above

Hello everyone, I also had this problem that I recently encountered and the solution I found, as it may be helpful to others. Im on Mac Monterey 12.6.3 and Xcode 14.2. I had an issue where my iOS app was crashing on launch when distributed through TestFlight for devices running iOS 14 and below. The crashes were difficult to diagnose as no crash logs were being generated. After exhausting several debugging options, I stumbled upon this thread and I followed suit, changing my app's minimum deployment target from iOS 14 to iOS 15. This effectively resolved the crashes and the app now runs smoothly through TestFlight on devices running iOS 15 and up. It's noteworthy that the issue seems to be related to the distribution through TestFlight, as the app ran without issues in local development and direct device installation from Xcode Organizer. It suggests that the problem may be on Apple's end with TestFlight or specific iOS versions' compatibility. I hope this helps anyone facing a similar issue! Looking forward to seeing Apple resolve this issue soon