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
You need to clear out the upload tokens that are "stuck". To do this, open the tokens file found in /users//.itmstransporter/UploadTokens/. You should see one line of text at the top that refers to your current upload token. Simply delete this line and save the file. You should now be able to submit your app again.
Cheers