im试图使用youtube_dl使Discord机器人将youtube的音频播放到vc。在聊天中运行play [youtube url]时出现一些错误

Traceback (most recent call last):
  File "C:\Users\User\AppData\Local\Programs\Python\Python37-32\lib\site-packages\discord\ext\commands\core.py",line 79,in wrapped
    ret = await coro(*args,**kwargs)
  File "C:\Users\User\AppData\Local\Programs\Python\Python37-32\bot1.py",line 169,in play
    voice_client = client.voice_client_in(server)
AttributeError: 'Bot' object has no attribute 'voice_client_in'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "C:\Users\User\AppData\Local\Programs\Python\Python37-32\lib\site-packages\discord\ext\commands\bot.py",line 863,in invoke
    await ctx.command.invoke(ctx)
  File "C:\Users\User\AppData\Local\Programs\Python\Python37-32\lib\site-packages\discord\ext\commands\core.py",line 728,in invoke
    await injected(*ctx.args,**ctx.kwargs)
  File "C:\Users\User\AppData\Local\Programs\Python\Python37-32\lib\site-packages\discord\ext\commands\core.py",line 88,in wrapped
    raise CommandInvokeError(exc) from exc
discord.ext.commands.errors.CommandInvokeError: Command raised an exception: AttributeError: 'Bot' object has no attribute 'voice_client_in' 

这是我为使机器人加入VC而编写的代码，它可以正确加入，但是在播放某些内容时，没有任何响应，并且给出了上面显示的错误。

@client.command()
async def join(ctx):
  channel = ctx.author.voice.channel
  await channel.connect()

@client.command()
async def leave(ctx):
  await ctx.voice_client.disconnect()



@client.command(pass_context=True)
async def play(ctx,url):
  server = ctx.message.guild

  voice_client = client.voice_client_in(server)
  players = await channel.connect_ytdl_player(url)
  players[server.id] = player
  player.start()    

我猜这是由于不和谐的重写api造成的，可以在此处进行更改以便正确运行。任何帮助将不胜感激