discord.py 和 youtube_dl，“读取错误"；和“会话因某种原因已失效"

And this is my code for the YTDL source and the queue function:

class YTDLSource(discord.PCMVolumeTransformer):
    def __init__(self, source, *, data, volume=0.5):
        super().__init__(source, volume)

        self.data = data

        self.title = data.get('title')
        self.url = data.get('url')

    @classmethod
    async def from_url(cls, url, *, loop=None, stream=False):
        loop = loop or asyncio.get_event_loop()
        data = await loop.run_in_executor(None, lambda: ytdl.extract_info(url, download=not stream))

        if 'entries' in data:
            # take first item from a playlist
            data = data['entries'][0]

        filename = data['url'] if stream else ytdl.prepare_filename(data)
        return cls(discord.FFmpegPCMAudio(filename, **ffmpeg_options), data=data)



queues = {}

class Music(commands.Cog):
    def __init__(self, bot):
        self.bot = bot

    @commands.command()
    async def q(self, ctx, *, url):
        channel = discord.utils.get(ctx.guild.voice_channels, name="Melodies of Arts")

        if ctx.voice_client is None:
            await channel.connect()


        def check_queue(error):
            if(queues[ctx.guild.id] != []):
                player = queues[ctx.guild.id].pop(0)
                ctx.voice_client.play(player, after=check_queue)     

        async with ctx.typing():
            player = await YTDLSource.from_url(url, loop=self.bot.loop, stream=True)

            if ctx.guild.id in queues:
                queues[ctx.guild.id].append(player)
            else:
                queues[ctx.guild.id] = [player]

            await ctx.send("Video __" + str(player.title) + "__" + " queued at **Position #" + str(len(queues[ctx.guild.id])) + "**", delete_after=15)

            if(not ctx.voice_client.is_playing()):
                ctx.voice_client.play(player, after=check_queue)
                await ctx.send('***Now playing:*** __{}__'.format(player.title), delete_after=10)

Github 问题页面建议重新下载 url"，但我正在使用 youtube_dl 流式传输链接，并且我希望尽可能避免下载视频.无论如何，很多 Github 问题似乎都已经过时了，因此任何与代码相关的解决方案都不再适用.如果我需要提供更多代码/信息，请告诉我！