PythonのDiscord botでエラー表示

!muteと出すとミュートロールが付くようにしたい

Discord botでミュートコマンドを実行するとロールが付くようにするコードでエラー表示

発生している問題・エラーメッセージ

Discord bot サーバーに接続中...
Conncting Discord bot server...
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Discord botサーバーに正常接続しました
Successfully server connected
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Ignoring exception in command mute:
Traceback (most recent call last):
  File "/data/user/0/ru.iiec.pydroid3/files/aarch64-linux-android/lib/python3.8/site-packages/discord/ext/commands/bot.py", line 903, in invoke
    await ctx.command.invoke(ctx)
  File "/data/user/0/ru.iiec.pydroid3/files/aarch64-linux-android/lib/python3.8/site-packages/discord/ext/commands/core.py", line 851, in invoke
    await self.prepare(ctx)
  File "/data/user/0/ru.iiec.pydroid3/files/aarch64-linux-android/lib/python3.8/site-packages/discord/ext/commands/core.py", line 786, in prepare
    await self._parse_arguments(ctx)
  File "/data/user/0/ru.iiec.pydroid3/files/aarch64-linux-android/lib/python3.8/site-packages/discord/ext/commands/core.py", line 697, in _parse_arguments
    transformed = await self.transform(ctx, param)
  File "/data/user/0/ru.iiec.pydroid3/files/aarch64-linux-android/lib/python3.8/site-packages/discord/ext/commands/core.py", line 552, in transform
    return await self.do_conversion(ctx, converter, argument, param)
  File "/data/user/0/ru.iiec.pydroid3/files/aarch64-linux-android/lib/python3.8/site-packages/discord/ext/commands/core.py", line 505, in do_conversion
    return await self._actual_conversion(ctx, converter, argument, param)
  File "/data/user/0/ru.iiec.pydroid3/files/aarch64-linux-android/lib/python3.8/site-packages/discord/ext/commands/core.py", line 451, in _actual_conversion
    ret = await instance.convert(ctx, argument)
  File "/data/user/0/ru.iiec.pydroid3/files/aarch64-linux-android/lib/python3.8/site-packages/discord/ext/commands/converter.py", line 427, in convert
    raise RoleNotFound(argument)
discord.ext.commands.errors.RoleNotFound: Role "<@566563356027125760>" not found.

不明

Python
1@client.command()
2@commands.has_permissions(administrator=True) 
3async def mute(ctx,rolename:discord.Role,user:discord.Member):
4   if rolename not in user.roles:
5       await user.add_roles(mute)
6       await ctx.send('Muteを対象ユーザーに実行しました')
7   else:
8       await ctx.send('__**既にMuteロールが付与されています**__/n警告するか検討して下さい')