I'm uploading a new build of an app and got this error while trying to upload it using Application Loader 3.6
I can't find anything about this error anywhere else. The error triggers almost immediately after hitting "Next" on the loader.
The Android version built fine and deployed without issue.
I've added a bounty to a StackExchange question that asked the same thing.
Was getting this error with Application Loader 3.6, but using Application Loader 3.0 worked for me, strangely.