我一直在研究用 python 編碼的不和諧機器人。當用戶加入服務器并離開服務器時，我一直試圖讓我的機器人說出一條消息。但是當我測試它時，我得到了 2 個錯誤，我不明白這些錯誤。而且我不確定我做錯了什么。如果有人可以幫助解釋這些錯誤，并為我的代碼指出正確的方向，我將不勝感激。我研究了discord rewrite api，并與朋友在我的服務器中對其進行了測試，當時我遇到了錯誤@client.eventasync def on_member_join(member):    channel = member.server.get_channel("499457708978864151")    msg = 'Welcome to the {1.name} Server, {0.mention}'    await client.say(channel, msg.format(member, member.server))@client.eventasync def on_member_remove(member):    channel = member.server.get_channel("499457708978864151")    msg = '{0.mention} has left the server'    await client.say((channel, msg.format(member, member.server)))我希望我的機器人在他們進入服務器時說歡迎使用（服務器的名稱）服務器，@username，當用戶離開時@username 已經離開服務器，但我收到了這些錯誤：TypeError: send_message() takes from 2 to 3 positional arguments but 4 were givendiscord.errors.InvalidArgument: Destination must be Channel, PrivateChannel, User, or Object. Received NoneType這是我的完整追溯Ignoring exception in on_member_joinTraceback (most recent call last):  File "C:\Users\Chris\PycharmProjects\untitled1\venv\lib\site-packages\discord\client.py", line 307, in _run_event    yield from getattr(self, event)(*args, **kwargs)  File "C:/Users/Chris/PycharmProjects/untitled1/RomaniBot.py", line 37, in on_member_join    await client.say(channel, msg.format(member, member.server))  File "C:\Users\Chris\PycharmProjects\untitled1\venv\lib\site-packages\discord\ext\commands\bot.py", line 350, in say    coro = self.send_message(destination, *args, **kwargs)TypeError: send_message() takes from 2 to 3 positional arguments but 4 were givenIgnoring exception in on_member_removeTraceback (most recent call last):