Missing user_loader or request_loader. Refer to http://flask-login.readthedocs.io/#how-it-works for more info.

Raise code

= _request_ctx_stack.top
        ctx.user = self.anonymous_user() if user is None else user

    def _load_user(self):
        '''Loads user from session or remember_me cookie as applicable'''

        if self._user_callback is None and self._request_callback is None:
            raise Exception(
                "Missing user_loader or request_loader. Refer to "
                "http://flask-login.readthedocs.io/#how-it-works "
                "for more info.")

        user_accessed.send(current_app._get_current_object())

        # Check SESSION_PROTECTION
        if s