Discord.py ping command doesn’t work in a cog

My ping command doesn’t work in a cog but works in my main.py file. Here’s the code for the cog:

import discord
from discord.ext import commands


class Misc(commands.Cog):
    def __init__(self, bot):
        self.bot = bot


    @commands.Cog.listener()
    async def on_ready(self):
        print('Misc cog loadedn-----')


    @commands.command()
    async def ping(self, ctx):
        await ctx.send(f'pong!n{round(bot.latency * 1000)}ms')


def setup(bot):
    bot.add_cog(Misc(bot))

When I run the ping command I get this error:

discord.ext.commands.errors.CommandInvokeError: Command raised an exception: NameError: name 'bot' is not defined

Answer

Simple solution, you added bot to your class object Misc as self.bot so when referring to bot.latency in that context you should actually be using self.bot.latency.