隨著我的機器人變得越來越大，我正在嘗試實現(xiàn)齒輪，但是我遇到了一個問題。我已經(jīng)設置并準備好我的整個代碼，但由于某種奇怪的原因，我不斷收到此錯誤：    Traceback (most recent call last):  File "C:\Users\Lauras\Desktop\Akagi Bot\main.py", line 107, in <module>    bot.add_cog("cogs.fun")  File "C:\Users\Lauras\AppData\Local\Programs\Python\Python36\lib\site-packages\discord\ext\commands\bot.py", line 477, in add_cog    raise TypeError('cogs must derive from Cog')TypeError: cogs must derive from Cog我在 main.py 上的代碼如下所示：   import discord    import asyncio    import typing    import random    import json    import oauth    from discord.ext import commandsbot = commands.Bot(command_prefix='~')@bot.eventasync def on_ready():    await bot.change_presence(activity=discord.Activity(name='with Kaga :3',type=0))    print (discord.__version__)    print(f"{bot.user.name} - {bot.user.id}")    print ('Akagi is ready to serve the Commander :3 !')    bot.add_cog("cogs.fun")    bot.run(oauth.bot_token)“有趣”的齒輪如下：import discordfrom discord.ext import commandsbot = commands.Bot(command_prefix='~')class FunCog:    def __init__(self, bot):        self.bot = bot    @commands.command()    async def hug(self, ctx):        await ctx.send('has been hugged by', file=discord.File('iloveyou.gif'))        passdef setup(bot: commands.Bot):    bot.add_cog(FunCog(bot))可能是什么問題呢？我也在使用 discord.py 重寫。謝謝 ！