I have the same error and I'm unable to respond to teh app rejection. @alex295 did you find a solution?
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Same error. Its having other issues as well. I think due to how its checkign to see what is a valid versionString
https://appstoreconnect.apple.com/iris/v1/apps/{{appID}}/appStoreVersions
Because its not returned the last 50 versions in descending order