Callback for join command is missing "ctx" parameter - python-3.x

Question

I'm trying to make a music cog for my bot. I'm currently making commands for the bot to join and leave a voice channel. But everytime i try to launch both of these commands, the same error occurs.
Ignoring exception in on_message
Traceback (most recent call last):
File "C:\Users\Daniel\AppData\Local\Programs\Python\Python38\lib\site-packages\discord\ext\commands\core.py", line 663, in _parse_arguments
next(iterator)
StopIteration
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\Daniel\AppData\Local\Programs\Python\Python38\lib\site-packages\discord\client.py", line 312, in _run_event
await coro(*args, **kwargs)
File "C:\Users\Daniel\AppData\Local\Programs\Python\Python38\lib\site-packages\discord\ext\commands\bot.py", line 930, in on_message
await self.process_commands(message)
File "C:\Users\Daniel\AppData\Local\Programs\Python\Python38\lib\site-packages\discord\ext\commands\bot.py", line 927, in process_commands
await self.invoke(ctx)
File "C:\Users\Daniel\AppData\Local\Programs\Python\Python38\lib\site-packages\discord\ext\commands\bot.py", line 892, in invoke
await ctx.command.invoke(ctx)
File "C:\Users\Daniel\AppData\Local\Programs\Python\Python38\lib\site-packages\discord\ext\commands\core.py", line 790, in invoke
await self.prepare(ctx)
File "C:\Users\Daniel\AppData\Local\Programs\Python\Python38\lib\site-packages\discord\ext\commands\core.py", line 751, in prepare
await self._parse_arguments(ctx)
File "C:\Users\Daniel\AppData\Local\Programs\Python\Python38\lib\site-packages\discord\ext\commands\core.py", line 666, in _parse_arguments
raise discord.ClientException(fmt.format(self))
discord.errors.ClientException: Callback for join/leave command is missing "ctx" parameter.
Here's the code i have:
import discord
from discord.ext import commands
import youtube_dl
class Music(commands.Cog):
def __init__(self, client):
self.client = client
#commands.command()
async def join(ctx):
channel = ctx.message.author.voice.channel
await channel.connect()
#commands.command()
async def leave(ctx):
await ctx.voice_client.diconnect()
def setup(client):
client.add_cog(Music(client))
Anyone know how i can fix this ?

Answer 1

You need to put self in your function async def join as well as your leave function:
#commands.command()
async def join(self, ctx):
channel = ctx.message.author.voice.channel
await channel.connect()
You're using a cog so you have a class with self that must be passed to classes not decorated with #staticmethod or #classmethod. With discord.py I recommend you do not do either of those for command/event functions you have above.
See: https://discordpy.readthedocs.io/en/latest/ext/commands/cogs.html
For cogs in discord.py