what shoul I do?

code:

import discord
import os

client = discord.Client

@client.event
async def on_ready():
  print("Bot gotowy".format(client))

@client.event
async def on_message(message):
  if message.author == client.user:
    return

  if message.content.startswith("/hello"):
    await message.channel.send("Hello!")

client.run(os.getenv("TOKEN"))

error:

  File "main.py", line 7, in <module>
    async def on_ready():
TypeError: event() missing 1 required positional argument: 'coro'

I’ve edited your post for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.

See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (’).