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The request token for this page is invalid. It may have already been used, or expired because it is too old. Please go back to the site or application that sent you here and try again; it was probably just a mistake

.def _twitter(self):
        # Get the access token supplied
        oauth_token = self.test_credentials.get('oauth_token')
        oauth_token_secret = self.test_credentials.get('oauth_token_secret')
        if not oauth_token or not oauth_token_secret:
            raise AuthenticationException('Invalid request format.', 400)

        auth = tweepy.OAuthHandler(current_app.config['TWITTER_CONSUMER_KEY'], current_app.config['TWITTER_CONSUMER_SECRET'])
        auth.set_access_token(oauth_token, oauth_token_secret)

        api = tweepy.API(auth)
        user = api.verify_credentials()

        if not user:
            raise AuthenticationException('Unable to verify credentials with remote server.', 500)

        # Save the user
        auth_string = self._auth_string(unicode(user.id_str))

        stored_user = User.query(User.auth_ids == auth_string).get()

        if not stored_user:
            return User(name=user.name)

        if stored_user and not stored_user.name:
            stored_user.name = user.name
            stored_user.put()

        return stored_user