Exception: Friendship class can not be instanciated directly! about python-wechaty HOT 6 CLOSED

class DingDongBot(Wechaty):
    # ...
    async def on_friendship(self, friendship: Friendship):
        print(friendship)
        print(friendship.type()

async def main():
    bot = DingDongBot()
    await bot.start()

2020-06-25 10:30:34,369 - Wechaty - INFO - receive <friendship> event <EventFriendshipPayload(friendship_id='8239572337309758562')>
INFO:Wechaty:receive <friendship> event <EventFriendshipPayload(friendship_id='8239572337309758562')>
2020-06-25 10:30:34,370 - FriendShip - INFO - Friendship constructor 8239572337309758562
INFO:FriendShip:Friendship constructor 8239572337309758562
2020-06-25 10:30:34,370 - Wechaty - ERROR - internal error <Friendship class can not be instanciated directly!>
ERROR:Wechaty:internal error <Friendship class can not be instanciated directly!>

def __init__(self, friendship_id: str):
        """
        initialization constructor for friendship
        """
        self.friendship_id = friendship_id
        self._payload: Optional[FriendshipPayload] = None

        log.info('Friendship constructor %s', friendship_id)

        # if self.__class__ is Friendship:
        #     raise Exception(
        #         'Friendship class can not be instanciated directly!')
        if self.puppet is None:
            raise Exception(
                'Friendship class can not be instanciated without a puppet!')

INFO:FriendShip:Friendship constructor 8568343363800708622
Friendship
/home/alfred/app/python-wechaty-getting-started/python-wechaty/src/wechaty/user/friendship.py:128: RuntimeWarning: coroutine 'Friendship.ready' was never awaited
  self.ready()
RuntimeWarning: Enable tracemalloc to get the object allocation traceback
2020-06-25 10:20:32,019 - Wechaty - ERROR - internal error <can"t load friendship payload>
ERROR:Wechaty:internal error <can"t load friendship payload>