How to fix Google App Engine Deployment: mvn appengine:update 403 Forbidden You do not have permission to modify this app

To fix
mvn appengine:update 403 Forbidden You do not have permission to modify this app
you have to rename or delete the .appcfg_oauth2_tokens_java file in your home directory, so that the next time you try to deploy it, it will ask again for authentication.

$ rm ~/.appcfg_oauth2_tokens_java

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