Swimbot Error

Traceback (most recent call last):
  File "C:\Users\swimm\AppData\Local\Programs\Python\Python37\lib\site-packages\discord\ext\commands\core.py", line 85, in wrapped
    ret = await coro(*args, **kwargs)
  File "c:\Users\swimm\OneDrive\Desktop\Swimbot\server_manager.py", line 61, in purge
    deleted = await ctx.channel.purge(limit=number)
  File "C:\Users\swimm\AppData\Local\Programs\Python\Python37\lib\site-packages\discord\channel.py", line 403, in purge
    await ret[-1].delete()
  File "C:\Users\swimm\AppData\Local\Programs\Python\Python37\lib\site-packages\discord\message.py", line 801, in delete
    await self._state.http.delete_message(self.channel.id, self.id)
  File "C:\Users\swimm\AppData\Local\Programs\Python\Python37\lib\site-packages\discord\http.py", line 243, in request
    raise NotFound(r, data)
discord.errors.NotFound: 404 Not Found (error code: 10003): Unknown Channel