When I call functions an error occurs
RuntimeError: Cannot acquire connection after closing pool
but I don’t close the pool anywhere

from aiomysql import create_pool, Cursor
import asyncio
from env import DATABASE, HOST, PORT, USER, PASSWORD


class Table:
    def __init__(self) -> None:
        l = asyncio.get_event_loop()
        self.pool = l.run_until_complete(create_pool(
            host=HOST,
            port=PORT,
            user=USER,
            password=PASSWORD,
            db=DATABASE,
            cursorclass=Cursor,
            autocommit=True,
            loop = asyncio.get_event_loop(),
            maxsize=15
        ))


    async def f(self):
        async with self.pool as pool:
            async with pool.acquire() as conn:
                async with conn.cursor() as cursor:
                    QUERY = f"""SELECT 1;"""
                    await cursor.execute(QUERY, (user_id))
                    return (await cursor.fetchone())[0]

Traceback:

  File "C:UsersUserAppDataLocalProgramsPythonPython311Libsite-packagesaiogramdispatcherdispatcher.py", line 415, in _process_polling_updates
    for responses in itertools.chain.from_iterable(await self.process_updates(updates, fast)):
                                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:UsersUserAppDataLocalProgramsPythonPython311Libsite-packagesaiogramdispatcherdispatcher.py", line 235, in process_updates
    return await asyncio.gather(*tasks)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:UsersUserAppDataLocalProgramsPythonPython311Libsite-packagesaiogramdispatcherhandler.py", line 117, in notify
    response = await handler_obj.handler(*args, **partial_data)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:UsersUserAppDataLocalProgramsPythonPython311Libsite-packagesaiogramdispatcherdispatcher.py", line 256, in process_update
    return await self.message_handlers.notify(update.message)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:UsersUserAppDataLocalProgramsPythonPython311Libsite-packagesaiogramdispatcherhandler.py", line 117, in notify
    response = await handler_obj.handler(*args, **partial_data)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:UsersUserDesktopmain.py", line 137, in start
    test = await table.f()
           ^^^^^^^^^^^^^^^
  File "c:UsersUserDesktopmain.py", line 43, in f
    async with pool.acquire() as conn:
  File "C:UsersUserAppDataLocalProgramsPythonPython311Libsite-packagesaiomysqlutils.py", line 134, in __aenter__
    self._conn = await self._coro
                 ^^^^^^^^^^^^^^^^
  File "C:UsersUserAppDataLocalProgramsPythonPython311Libsite-packagesaiomysqlpool.py", line 139, in _acquire
    raise RuntimeError("Cannot acquire connection after closing pool")
RuntimeError: Cannot acquire connection after closing pool