[Solved] This application does not exist (app_id=u'
Today I started receiving strange error while uploading some changes to my existing app. ../appcfgy.py update . Error 404: --- begin server output --- This application does not exist (app_id=u'my_app_id'). --- end server output --- Turns out Google had cached my different login which I had used to update a different app. And it was trying to use that cached login to update this app as well. So I fixed it by removing the cache: rm -rf ~/.appcfg_cookies After this ../appcfgy.py update . will run successfully.