I'm trying to make a discord bot, and I am following a simple tutorial, and I can't get the simplest command to work.
I am on python 3.6 and running discord.py version 0.16.12

```
    #Imports
import time
import discord
import asyncio
from discord.ext import commands

#Initialize
client = discord.Client()#Creates Client
bot = commands.Bot(command_prefix='!')#Sets prefix for commands(!Command)

#Code
@bot.command()
async def SendMessage(ctx):
    await ctx.send('Hello')

```

The code should work but it gives me the error `discord.ext.commands.errors.MissingRequiredArgument: ctx is a required argument that is missing.`