Application Loader: “Cannot proceed with delivery: an existing transporter instance is currently uploading this package”

Question

I have been unable to overcome this error in Application Loader. I\'ve quit, restarted, tried different computers - it\'s like the server is hung up on an op that I never i

Answer 1

In my case (I am using OSX Catalina), I was not able to find the folder:

Library/Caches/com.apple.amp.itmstransporter/UploadTokens/

Under my user home directory (even when showing hidden files and folders)

but it seems my problem was a bit different and I just closed xCode completely (every xCode window opened) and reopened it again then I archived my project and uploaded it without any issues

maybe this could help someone else fix this issue