DropboxAuthError (User is not authenticated.)

[vajapravin]

I have created new app on Dropbox.com/developers. And authorized using rake task.
rake dropbox:authorize APP_KEY=app_key APP_SECRET=app_secret ACCESS_TYPE..

After authorized, It says DropboxAuthError (User is not authenticated) error.

[Sasikala-Ravichandran]

I may be late to answer but it may help someone.
In Dropbox's developers console, changing the 'Development user' setting works.
Initially when an app is created, 'Development users' will be 'Only you'. So click 'Enable additional users' button which allows more user to access the app.