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

Tried to upload to the app this morning (first time i've tried since Friday) and it just worked (first time...!)

No idea what the issue was as I haven't done any work on this over the weekend so everything should have been the same as it was on Friday.