Traceback (most recent call last):
  File "/modmailbot/bot.py", line 881, in add_reaction
    await msg.add_reaction(reaction)
  File "/usr/local/lib/python3.9/site-packages/discord/message.py", line 1061, in add_reaction
    await self._state.http.add_reaction(self.channel.id, self.id, emoji)
  File "/usr/local/lib/python3.9/site-packages/discord/http.py", line 740, in request
    raise NotFound(response, data)
discord.errors.NotFound: 404 Not Found (error code: 10008): Unknown Message

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/discord/ext/commands/core.py", line 190, in wrapped
    ret = await coro(*args, **kwargs)
  File "/modmailbot/cogs/utility.py", line 52, in command_callback
    return await super().command_callback(ctx, command=command)
  File "/usr/local/lib/python3.9/site-packages/discord/ext/commands/help.py", line 943, in command_callback
    return await self.send_bot_help(mapping)
  File "/modmailbot/cogs/utility.py", line 128, in send_bot_help
    return await session.run()
  File "/modmailbot/core/paginator.py", line 162, in run
    await self.close(delete=False)
  File "/modmailbot/core/paginator.py", line 183, in close
    await self.ctx.bot.add_reaction(self.ctx.message, sent_emoji)
  File "/modmailbot/bot.py", line 882, in add_reaction
    except (discord.HTTPException, discord.BadArgument) as e:
AttributeError: module 'discord' has no attribute 'BadArgument'

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

Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/discord/ext/commands/bot.py", line 1347, in invoke
    await ctx.command.invoke(ctx)
  File "/usr/local/lib/python3.9/site-packages/discord/ext/commands/core.py", line 986, in invoke
    await injected(*ctx.args, **ctx.kwargs)  # type: ignore
  File "/usr/local/lib/python3.9/site-packages/discord/ext/commands/core.py", line 199, in wrapped
    raise CommandInvokeError(exc) from exc
discord.ext.commands.errors.CommandInvokeError: Command raised an exception: AttributeError: module 'discord' has no attribute 'BadArgument'