This application does not exist (app_id=xxx)

Question

I was unable to upload to an AppEngine as appcfg was telling me :

This application does not exist (app_id=u\'xxx\').

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Answer 1

Posting Ric Moore's comment in the selected answer because that is a valid answer and it worked in my case (and hopefully it helps someone else having the same issue spot it quickly).

I have an alternation solution - in the Google App Engine Launcher select from the menu Control > Clear Deployment Credential. Then when you click Deploy it will take you through the auth flow again and you can select the correct account. - Ric Moore