Discord bot "RuntimeError: Cannot close a running event loop" error

I keep getting this error "RuntimeError: Cannot close a running event loop" whenever I run the code below, tried many solutions but none of them worked.

I am using jupyter notebook, print(discord.__version__) --> 1.7.3

Thanks in advance.

import nest_asyncio
nest_asyncio.apply()

import discord
import os
from dotenv import load_dotenv

# https://stackoverflow.com/questions/63530888/how-would-i-go-about-creating-an-env-file-for-my-discord-bot-token


client = discord.Client()

@client.event
async def on_ready():
    print('Logged in as {0.user}'.format(client))
    
    
@client.event
async def on_message(message):
    if message.author == message.user:
        return
    if message.content.startswith('$hello'):
        await message.channel.send('Hello!')
        
        
TOKEN = os.getenv("token")

client.run('TOKEN')

code output:

Task exception was never retrieved future: <Task finished name='Task-21' coro=<Client.run..runner() done, defined at C:\Users\username\anaconda3\lib\site-packages\discord\client.py:700> exception=LoginFailure('Improper token has been passed.')> Traceback (most recent call last): File "C:\Users\username\anaconda3\lib\site-packages\discord\http.py", line 300, in static_login data = await self.request(Route('GET', '/users/@me')) File "C:\Users\username\anaconda3\lib\site-packages\discord\http.py", line 254, in request raise HTTPException(r, data) discord.errors.HTTPException: 401 Unauthorized (error code: 0): 401: Unauthorized

The above exception was the direct cause of the following exception:

Traceback (most recent call last): File "C:\Users\username\anaconda3\lib\asyncio\tasks.py", line 280, in __step result = coro.send(None) File "C:\Users\username\anaconda3\lib\site-packages\discord\client.py", line 702, in runner await self.start(*args, **kwargs) File "C:\Users\username\anaconda3\lib\site-packages\discord\client.py", line 665, in start await self.login(*args, bot=bot) File "C:\Users\username\anaconda3\lib\site-packages\discord\client.py", line 511, in login await self.http.static_login(token.strip(), bot=bot) File "C:\Users\username\anaconda3\lib\site-packages\discord\http.py", line 304, in static_login raise LoginFailure('Improper token has been passed.') from exc discord.errors.LoginFailure: Improper token has been passed.

RuntimeError                              Traceback (most recent call last)
<ipython-input-10-ccfa19a2810e> in <module>
     26 TOKEN = os.getenv("token")
     27 
---> 28 client.run('TOKEN')
     29 
     30 

~\anaconda3\lib\site-packages\discord\client.py in run(self, *args, **kwargs)
    717             future.remove_done_callback(stop_loop_on_completion)
    718             log.info('Cleaning up tasks.')
--> 719             _cleanup_loop(loop)
    720 
    721         if not future.cancelled():

~\anaconda3\lib\site-packages\discord\client.py in _cleanup_loop(loop)
     93     finally:
     94         log.info('Closing the event loop.')
---> 95         loop.close()
     96 
     97 class _ClientEventTask(asyncio.Task):

~\anaconda3\lib\asyncio\selector_events.py in close(self)
     87     def close(self):
     88         if self.is_running():
---> 89             raise RuntimeError("Cannot close a running event loop")
     90         if self.is_closed():
     91             return

RuntimeError: Cannot close a running event loop