Swimbot Error

Traceback (most recent call last):
  File "/home/pi/Swimbot/whois.py", line 414, in whois
    rxn, user = await self.bot.wait_for('reaction_add', timeout=15, check=check_user)
  File "/usr/lib/python3.7/asyncio/tasks.py", line 423, in wait_for
    raise futures.TimeoutError()
concurrent.futures._base.TimeoutError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/pi/.local/lib/python3.7/site-packages/discord/ext/commands/core.py", line 85, in wrapped
    ret = await coro(*args, **kwargs)
  File "/home/pi/Swimbot/whois.py", line 430, in whois
    await message.clear_reactions()
  File "/home/pi/.local/lib/python3.7/site-packages/discord/message.py", line 1096, in clear_reactions
    await self._state.http.clear_reactions(self.channel.id, self.id)
  File "/home/pi/.local/lib/python3.7/site-packages/discord/http.py", line 243, in request
    raise NotFound(r, data)
discord.errors.NotFound: 404 Not Found (error code: 10008): Unknown Message