I am missing 1 required positional argument: (coro) in discord.py?

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Python

I have been working on a Discord bot using discord.py and I am fairly new to Python. I keep getting an error like this:

Quote:

Traceback (most recent call last):
File "main.py", line 34, in <module>
@bot.event()
TypeError: event() missing 1 required positional argument: 'coro'

What I have tried:

I have looked over my code and other similar questions and my code is just like other people's and looks fine. Here is the specific part of the code that had the error:

@bot.event()
async def on_message(message):
    if message.author == bot.user:
        return
    if not message.guild:
        try:
            await message.channel.send("This is a DM.")
        except discord.errors.Forbidden:
            pass
    else:
        pass

If anyone finds anything wrong with it, please tell me.

Thanks!