# Buggy code
async def local_folder(
    self,
    ctx: commands.Context,
    play_subfolders: Optional[bool] = True,
    *,
    folder: str = None,
):
    """Play all songs in a localtracks folder."""
    if not await self._localtracks_check(ctx):
        return

    if not folder:
        await ctx.invoke(self.local_play, play_subfolders=play_subfolders)
    else:
        folder = folder.strip()
        _dir = audio_dataclasses.LocalPath.joinpath(folder)
        if not _dir.exists():
            return await self._embed_msg(
                ctx, _("No localtracks folder named {name}.").format(name=folder)
            )
        query = audio_dataclasses.Query.process_input(
            _dir, search_subfolders=play_subfolders
        )
        await self._local_play_all(
            ctx, query, from_search=False if not folder else True
        )


# 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 local_folder(
    self,
    ctx: commands.Context,
    play_subfolders: Optional[bool] = True,
    *,
    folder: str = None,
):
    """Play all songs in a localtracks folder."""
    if not await self._localtracks_check(ctx):
        return

    if not folder:
        await ctx.invoke(self.local_play, play_subfolders=play_subfolders)
    else:
        folder = folder.strip()
        _dir = audio_dataclasses.LocalPath.joinpath(folder)
        if not _dir.exists():
            return await self._embed_msg(
                ctx,
                title=_("Folder Not Found"),
                description=_("Localtracks folder named {name} does not exist.").format(
                    name=folder
                ),
            )
        query = audio_dataclasses.Query.process_input(
            _dir, search_subfolders=play_subfolders
        )
        await self._local_play_all(
            ctx, query, from_search=False if not folder else True
        )