# Buggy code
async def _playlist_remove(
    self,
    ctx: commands.Context,
    playlist_matches: PlaylistConverter,
    url: str,
    *,
    scope_data: ScopeParser = None,
):
    """Remove a track from a playlist by url.

     **Usage**:
    ​ ​ ​ ​ [p]playlist remove playlist_name_OR_id url args

    **Args**:
    ​ ​ ​ ​ The following are all optional:
    ​ ​ ​ ​ ​ ​ ​ ​ --scope <scope>
    ​ ​ ​ ​ ​ ​ ​ ​ --author [user]
    ​ ​ ​ ​ ​ ​ ​ ​ --guild [guild] **Only the bot owner can use this**

    Scope is one of the following:
    ​ ​ ​ ​ Global
    ​ ​ ​ ​ Guild
    ​ ​ ​ ​ User

    Author can be one of the following:
    ​ ​ ​ ​ User ID
    ​ ​ ​ ​ User Mention
    ​ ​ ​ ​ User Name#123

    Guild can be one of the following:
    ​ ​ ​ ​ Guild ID
    ​ ​ ​ ​ Exact guild name

    Example use:
    ​ ​ ​ ​ [p]playlist remove MyGuildPlaylist https://www.youtube.com/watch?v=MN3x-kAbgFU
    ​ ​ ​ ​ [p]playlist remove MyGlobalPlaylist https://www.youtube.com/watch?v=MN3x-kAbgFU
    --scope Global
    ​ ​ ​ ​ [p]playlist remove MyPersonalPlaylist https://www.youtube.com/watch?v=MN3x-kAbgFU
    --scope User
    """
    if scope_data is None:
        scope_data = [PlaylistScope.GUILD.value, ctx.author, ctx.guild, False]
    scope, author, guild, specified_user = scope_data
    scope_name = humanize_scope(
        scope, ctx=guild if scope == PlaylistScope.GUILD.value else author
    )

    try:
        playlist_id, playlist_arg = await self._get_correct_playlist_id(
            ctx, playlist_matches, scope, author, guild, specified_user
        )
    except TooManyMatches as e:
        return await self._embed_msg(ctx, str(e))
    if playlist_id is None:
        return await self._embed_msg(
            ctx, _("Could not match '{arg}' to a playlist.").format(arg=playlist_arg)
        )

    try:
        playlist = await get_playlist(playlist_id, scope, self.bot, guild, author)
    except RuntimeError:
        return await self._embed_msg(
            ctx,
            _("Playlist {id} does not exist in {scope} scope.").format(
                id=playlist_id, scope=humanize_scope(scope, the=True)
            ),
        )
    except MissingGuild:
        return await self._embed_msg(
            ctx, _("You need to specify the Guild ID for the guild to lookup.")
        )

    if not await self.can_manage_playlist(scope, playlist, ctx, author, guild):
        return

    track_list = playlist.tracks
    clean_list = [track for track in track_list if url != track["info"]["uri"]]
    if len(track_list) == len(clean_list):
        return await self._embed_msg(ctx, _("URL not in playlist."))
    del_count = len(track_list) - len(clean_list)
    if not clean_list:
        await delete_playlist(
            scope=playlist.scope,
            playlist_id=playlist.id,
            guild=guild,
            author=playlist.author,
        )
        return await self._embed_msg(ctx, _("No tracks left, removing playlist."))
    update = {"tracks": clean_list, "url": None}
    await playlist.edit(update)
    if del_count > 1:
        await self._embed_msg(
            ctx,
            _(
                "{num} entries have been removed from the"
                " playlist {playlist_name} (`{id}`) [**{scope}**]."
            ).format(
                num=del_count,
                playlist_name=playlist.name,
                id=playlist.id,
                scope=scope_name,
            ),
        )
    else:
        await self._embed_msg(
            ctx,
            _(
                "The track has been removed from the"
                " playlist: {playlist_name} (`{id}`) [**{scope}**]."
            ).format(playlist_name=playlist.name, id=playlist.id, scope=scope_name),
        )


# Traceback (RuntimeError)
Traceback (most recent call last):
File "/home/martinebots/martinebotsvenv/lib/python3.7/site-packages/discord/ext/commands/core.py", line 79, in wrapped
ret = await coro(*args, **kwargs)
File "/home/martinebots/martinebotscogs/cogs_modified/audio/audio.py", line 3183, in play
await self._enqueue_tracks(ctx, query)
File "/home/martinebots/martinebotscogs/cogs_modified/audio/audio.py", line 3885, in _enqueue_tracks
result, called_api = await self.music_cache.lavalink_query(ctx, player, query)
File "/home/martinebots/martinebotscogs/cogs_modified/audio/apis.py", line 911, in lavalink_query
results = await player.load_tracks(query)
File "/home/martinebots/martinebotsvenv/lib/python3.7/site-packages/lavalink/rest_api.py", line 300, in load_tracks
self.__check_node_ready()
File "/home/martinebots/martinebotsvenv/lib/python3.7/site-packages/lavalink/rest_api.py", line 268, in __check_node_ready
raise RuntimeError("Cannot execute REST request when node not ready.")
RuntimeError: Cannot execute REST request when node not ready.

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/home/martinebots/martinebotsvenv/lib/python3.7/site-packages/discord/ext/commands/bot.py", line 863, in invoke
await ctx.command.invoke(ctx)
File "/home/martinebots/martinebotsvenv/lib/python3.7/site-packages/discord/ext/commands/core.py", line 728, in invoke
await injected(*ctx.args, **ctx.kwargs)
File "/home/martinebots/martinebotsvenv/lib/python3.7/site-packages/discord/ext/commands/core.py", line 88, in wrapped
raise CommandInvokeError(exc) from exc
discord.ext.commands.errors.CommandInvokeError: Command raised an exception: RuntimeError: Cannot execute REST request when node not ready.```

# Fixed code
async def _playlist_remove(
    self,
    ctx: commands.Context,
    playlist_matches: PlaylistConverter,
    url: str,
    *,
    scope_data: ScopeParser = None,
):
    """Remove a track from a playlist by url.

     **Usage**:
    ​ ​ ​ ​ [p]playlist remove playlist_name_OR_id url args

    **Args**:
    ​ ​ ​ ​ The following are all optional:
    ​ ​ ​ ​ ​ ​ ​ ​ --scope <scope>
    ​ ​ ​ ​ ​ ​ ​ ​ --author [user]
    ​ ​ ​ ​ ​ ​ ​ ​ --guild [guild] **Only the bot owner can use this**

    **Scope** is one of the following:
    ​ ​ ​ ​ Global
    ​ ​ ​ ​ Guild
    ​ ​ ​ ​ User

    **Author** can be one of the following:
    ​ ​ ​ ​ User ID
    ​ ​ ​ ​ User Mention
    ​ ​ ​ ​ User Name#123

    **Guild** can be one of the following:
    ​ ​ ​ ​ Guild ID
    ​ ​ ​ ​ Exact guild name

    Example use:
    ​ ​ ​ ​ [p]playlist remove MyGuildPlaylist https://www.youtube.com/watch?v=MN3x-kAbgFU
    ​ ​ ​ ​ [p]playlist remove MyGlobalPlaylist https://www.youtube.com/watch?v=MN3x-kAbgFU
    --scope Global
    ​ ​ ​ ​ [p]playlist remove MyPersonalPlaylist https://www.youtube.com/watch?v=MN3x-kAbgFU
    --scope User
    """
    if scope_data is None:
        scope_data = [PlaylistScope.GUILD.value, ctx.author, ctx.guild, False]
    scope, author, guild, specified_user = scope_data
    scope_name = humanize_scope(
        scope, ctx=guild if scope == PlaylistScope.GUILD.value else author
    )

    try:
        playlist_id, playlist_arg = await self._get_correct_playlist_id(
            ctx, playlist_matches, scope, author, guild, specified_user
        )
    except TooManyMatches as e:
        return await self._embed_msg(ctx, title=str(e))
    if playlist_id is None:
        return await self._embed_msg(
            ctx,
            title=_("Playlist Not Found"),
            description=_("Could not match '{arg}' to a playlist.").format(
                arg=playlist_arg
            ),
        )
    try:
        playlist = await get_playlist(playlist_id, scope, self.bot, guild, author)
    except RuntimeError:
        return await self._embed_msg(
            ctx,
            title=_("Playlist Not Found"),
            description=_("Playlist {id} does not exist in {scope} scope.").format(
                id=playlist_id, scope=humanize_scope(scope, the=True)
            ),
        )
    except MissingGuild:
        return await self._embed_msg(
            ctx,
            title=_("Missing Arguments"),
            description=_("You need to specify the Guild ID for the guild to lookup."),
        )

    if not await self.can_manage_playlist(scope, playlist, ctx, author, guild):
        return

    track_list = playlist.tracks
    clean_list = [track for track in track_list if url != track["info"]["uri"]]
    if len(track_list) == len(clean_list):
        return await self._embed_msg(ctx, title=_("URL not in playlist."))
    del_count = len(track_list) - len(clean_list)
    if not clean_list:
        await delete_playlist(
            scope=playlist.scope,
            playlist_id=playlist.id,
            guild=guild,
            author=playlist.author,
        )
        return await self._embed_msg(ctx, title=_("No tracks left, removing playlist."))
    update = {"tracks": clean_list, "url": None}
    await playlist.edit(update)
    if del_count > 1:
        await self._embed_msg(
            ctx,
            title=_("Playlist Modified"),
            description=_(
                "{num} entries have been removed "
                "from the playlist {playlist_name} (`{id}`) [**{scope}**]."
            ).format(
                num=del_count,
                playlist_name=playlist.name,
                id=playlist.id,
                scope=scope_name,
            ),
        )
    else:
        await self._embed_msg(
            ctx,
            title=_("Playlist Modified"),
            description=_(
                "The track has been removed from the playlist: "
                "{playlist_name} (`{id}`) [**{scope}**]."
            ).format(playlist_name=playlist.name, id=playlist.id, scope=scope_name),
        )