Swimbot Error

Traceback (most recent call last):
  File "/home/pi/Swimbot/venv/lib/python3.9/site-packages/discord/ext/commands/core.py", line 85, in wrapped
    ret = await coro(*args, **kwargs)
  File "/home/pi/testingWaitlist/waitlist.py", line 83, in waitlist
    await self.wait_board(ctx.message.channel)
  File "/home/pi/testingWaitlist/waitlist.py", line 468, in wait_board
    if not self.player_string(player):
  File "/home/pi/testingWaitlist/waitlist.py", line 66, in player_string
    date = arrow.get(time_list[index]).format("MM/DD")
  File "/home/pi/Swimbot/venv/lib/python3.9/site-packages/arrow/api.py", line 91, in get
    return _factory.get(*args, **kwargs)
  File "/home/pi/Swimbot/venv/lib/python3.9/site-packages/arrow/factory.py", line 254, in get
    dt = parser.DateTimeParser(locale).parse_iso(arg, normalize_whitespace)
  File "/home/pi/Swimbot/venv/lib/python3.9/site-packages/arrow/parser.py", line 298, in parse_iso
    return self._parse_multiformat(datetime_string, formats)
  File "/home/pi/Swimbot/venv/lib/python3.9/site-packages/arrow/parser.py", line 727, in _parse_multiformat
    raise ParserError(
arrow.parser.ParserError: Could not match input '[' to any of the following formats: YYYY-MM-DD, YYYY-M-DD, YYYY-M-D, YYYY/MM/DD, YYYY/M/DD, YYYY/M/D, YYYY.MM.DD, YYYY.M.DD, YYYY.M.D, YYYYMMDD, YYYY-DDDD, YYYYDDDD, YYYY-MM, YYYY/MM, YYYY.MM, YYYY, W.