Проблема в програме Python

У меня вылазит ошибка в ydl.download([sourse]) 85 строка вот код:

# -*- coding: utf = 8 -*-
import discord
from discord.ext import commands
from config import token
import youtube_dl
import os


bot = commands.Bot(command_prefix='!')


@bot.event
async def on_ready():
    print('Я зайшов в систему.')


server, servers_id, name_channel = None, None, None
domains = ['https://www.youtube.com/', 'http://www.youtube.com/', 'https://youtu.be/']


async def check_domains(link):
    for x in domains:
        if link.startswith(x):
            return True
    return False


@bot.command()
async def play(ctx, *, command=None):
    """Робить музон"""
    global server, servers_id, name_channel
    author = ctx.author
    if command == None:
        server = ctx.guild
        name_channel = author.Voice.channel.name
        voice_channel = discord.utils.get(server.voice_channels, name=name_channel)
    params = command.split(' ')
    if len(params) == 1:
        sourse = params[0]
        server = ctx.guild
        name_channel = author.voice.channel.name
        voice_channel = discord.utils.get(server.voice_channels, name=name_channel)
        print('param 1')
    elif len(params) == 3:
        server_id = params[0]
        voice_id = params[1]
        sourse = params[2]
        try:
            server_id = int(server_id)
            voice_id = int(voice_id)
        except:
            await ctx.chanel.send(f'{author.mention}, id сервера або войса має бути цілим числом.')
            return
        print('param 3')
        server = bot.get_guild(server_id)
        voice_channel = discord.utils.get(server.voice.channels, id=voice_id)
    else:
        await ctx.channel.send(f'{author.mention}, команда не коректна.')
        return
    voice = discord.utils.get(bot.voice_clients, guild=server)
    if voice is None:
        await voice_channel.connect()
        voice = discord.utils.get(bot.voice_clients, guild=server)
    if sourse == None:
        pass
    elif sourse.startswith('https'):
        if not await check_domains(sourse):
            await ctx.channel.send(f'{author.mention}, cилка не доступна.')
            return
        song_there = os.path.isfile('song.mp3')
        try:
            if song_there:
                os.remove('song.mp3')
        except PermissionError:
            await ctx.channel.send('Не достатньо прав.')
            return

        ydl_opts = {'format': 'bestaudio/best',
            'postprocessors': [
                {'key': 'FFmpegExtractAudio',
                    'preferredcodec': 'mp3',
                    'preferredquality': '192', }
            ], }
        with youtube_dl.YoutubeDL(ydl_opts) as ydl:
            ydl.download([sourse])
        for file in os.listdir('./'):
            if file.endswith('.mp3'):
                name = file
                os.rename(file, 'song.mp3')
        voice.play(discord.FFmpegPCMAudio('song.mp3'))
    else:
        voice.play(discord.FFmpegPCMAudio(f'{sourse}'))


@bot.command()
async def leave(ctx):
    global server, name_channel
    voice = discord.utils.get(bot.voice_clients, guild=server)
    if voice.is_connected():
        await voice.disconnect()
    else:
        await ctx.channel.send(f'{ctx.author.maintion}, бот уже вийшов.')


@bot.command()
async def pause(ctx):
    voice = discord.utils.get(bot.voice_clients, guild=server)
    if voice.is_plaing():
        voice.pause()
    else:
        await ctx.channel.send('Бот уже на паузі.')


@bot.command()
async def resume(ctx):
    voice = discord.utils.get(bot.voice_clients, guild=server)
    if voice.is_paused():
        voice.resume()
    else:
        await ctx.channel.send('Музика уже грає.')


@bot.command()
async def stop():
    voice = discord.utils.get(bot.voice_clients, guild=server)
    voice.stop()


bot.run(token)

Буду очень благодарен если поможете