discord python bot leave命令不工作

下面是用于join和leave命令的代码。 加入很好，但离开却不行。在stackoverflow上尝试了许多解决方案，但都没有成功

@commands.command(name='join')
  async def join(self, ctx):
    print('join command worked')
    member = utils.find(lambda m: m.id == ctx.author.id, ctx.guild.members)
    if member is not None and member.voice is not None:
      vc = member.voice.channel
      player = self.bot.music.player_manager.create(ctx.guild.id, endpoint=str(ctx.guild.region))
      if not player.is_connected:
        player.store('channel', ctx.channel.id)
        await self.connect_to(ctx.guild.id, str(vc.id))```

  
@commands.command(pass_context=True)
  async def leave(ctx):
      if (ctx.guild.voice_client):
          await ctx.guild.voice_client.disconnect()
          await message.channel.send('Bot has left')
      else:
          await ctx.channel.send("I'm not in a voice channel, use join command to add me.")```

Any possible solutions?
Thanks

---

看起来变量

message

在当前范围内不存在：仅使用

ctx.send（“Bot已离开”）

就可以正常工作