It FINALLY worked for me!
I started to get this error since September 15th, coincidently the day Apple released Xcode 12. No matter which version of Xcode I used (11.7 or 12), and which build I sent, I always got this error after successful upload and during process time. I even tried a build which successfully uploaded and processed to Testflight on September 13th and this also failed.
Well, today I decided to give it a shot and upgrade my Xcode to version 12.0.1, and magically this error stopped happening.
victor.rendon.rapp
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