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

The fix I found was to add the parameter --no_cookies:

appcfg.py update --no_cookies MyProjectDirectory/

This can happen when you upload AppEngine applications from different Google accounts on the same computer.