GAE google task api "Error: Not Found" - google-app-engine

I have followed this google task api tutorial on GAE: https://developers.google.com/appengine/articles/python/getting_started_with_tasks_api
I have tried everything they did.
I have added this in the route:
('/mytask', mytask),
('/mytask'+ decorator.callback_path, decorator.callback_handler()),
yet I am getting following error:
Error: Not Found
The requested URL /oauth2callback?state=http://sadaf2605.appspot.com/mytask:rBFVjEpyDnAPoYsm-J6COToxMzY1NDM0ODg4&code=4/DVdE2clKgg1yfLTcFL9AdGzszVvj.snlDhp_QkQYZgrKXntQAax1q0onUewI was not found on this server.
Can you guys please tell me where can I expect a bug?

You're not attaching the handler to the right URL: you're prefixing it with '/mytask'. If you don't want it to serve on the default /oauth2callback, then you need to pass callback_path when you create the OAuth2Decorator

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