Error RuntimeError: There is no current event loop in thread 'Thread-3'.

[Xalwer]

When executing the after=self.after argument to the play() method, an error occurs:

Traceback (most recent call last):
  File "/home/container/.local/lib/python3.11/site-packages/disnake/player.py", line 743, in _call_after
    self.after(error)
  File "/home/container/cogs/music.py", line 51, in after
    CheckSound.start()
  File "/home/container/.local/lib/python3.11/site-packages/disnake/ext/tasks/__init__.py", line 330, in start
    self.loop = asyncio.get_event_loop()
                ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/asyncio/events.py", line 677, in get_event_loop
    raise RuntimeError('There is no current event loop in thread %r.'
RuntimeError: There is no current event loop in thread 'Thread-3'.

part of the code:

import asyncio
import disnake

from disnake.ext import commands,tasks 
from yt_dlp import YoutubeDL


class Music(commands.Cog):
    def __init__(self, bot: commands.Bot):
        self.bot = bot
        self.vc = None
        self.owner = None
        self.playlisturl = []


    def URLconvert(self,url): 
        with YoutubeDL(self.YDL_OPTIONS) as ydl:
            if 'https://www.youtube.com' not in url:
                info = ydl.extract_info('ytsearch:%s' % url,download=False)['entries'][0]
            else:
                info = ydl.extract_info(url, download=False)
        return (info['url'],info['original_url'])


    def after(self,err):
        #if any(self.playlisturl) == False:
        CheckSound = disnake.ext.tasks.loop(seconds=1,count=60)(self.SoundLoop)
        CheckSound.start()


    async def SoundLoop(self):
        print('test')


    @commands.slash_command(name='play', description='')
    async def play(self, inter: disnake.ApplicationCommandInteraction,
                   url: str):

        channelX = inter.author.voice.channel
        self.vc = await channelX.connect()
        link = self.URLconvert(url=url)[0]

        FFmpeg = disnake.FFmpegPCMAudio(link,**self.FFMPEG_OPTIONS)
        FFmpeg.read()

        self.vc.play(FFmpeg,after=self.after)

[dlchamp]

Try changing CheckSound = disnake.ext.tasks.loop(seconds=1,count=60)(self.SoundLoop) to
CheckSound = tasks.loop(seconds=1,count=60)(self.SoundLoop)

ext is not a package so you cannot use it the way you're currently using it.

either use the suggestion above or add a new import import disnake.ext.tasks

[Xalwer]

Thanks for the answer, but it doesn't work.
Here is the source code if you need it.

[dlchamp]

While it's not a direct answer to the problem but, why not use something like mafic with lavalink?
It simplifies this entire process and moves most of this into a separate service that handles the youtube (plus other services) stuff and provides your bot a stream that's ready to go also eliminates the use of requests (blocking) to hit Youtube API or dealing with threading and such.

But for your issue:
It's likely because vc.play() creates an AudioPlayer(threading.Thread) (which is also where after is called) in a new thread which does not have an event loop. Threads + asyncio just make it more complicated when there is a very simple solution - see above.

As for a solution:
Maybe something like this?

def after(self, err):
    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)

    CheckSound = tasks.loop(seconds=1, count=60)(self.SoundLoop)
    loop.run_until_complete(CheckSound.start())


async def SoundLoop(self):
    # if any(self.playlisturl) == True:
    #    print(2)
    #    return
    # if self.SoundLoop.current_loop == self.SoundLoop.count - 1:
    #    print(1)
    print(1)

[Xalwer]

This helped, thanks for solving my problem, good luck!