messages are not being processed

INFO:aiogram.event:Update id=794626540 is not handled. Duration 3 ms by bot id=7469046391

I'm not a programmer and I can't understand at all why it stopped reading the start message, explain how to work with the router and what did I do wrong?

I think there's something missing here, but I don't understand.

my code:

import asyncio
import logging

from aiogram import Bot, Dispatcher, types, F, Router
from aiogram.types import Message
from aiogram.filtersmand import Command
from aiogram.fsm.context import FSMContext
from aiogram.fsm.state import State, StatesGroup
from aiogram.utils.markdown import hbold, hlink
from aiogram.utils.chat_action import ChatActionSender


from config import TOKEN
from aiogram.fsm.storage.memory import MemoryStorage

storage = MemoryStorage()
dp = Dispatcher(storage=storage)
logging.basicConfig(level=logging.INFO)
bot = Bot(token=TOKEN)

class Form(StatesGroup):
    brand = State()
    model = State()
    year = State()
    vin = State()
    parts = State()
    problem = State()

questionnaire_router = Router()


@questionnaire_router.message(Command("start"))
async def start_questionnaire_process(message: Message):
    async with ChatActionSender.typing(bot=bot, chat_id=message.chat.id):
        await asyncio.sleep(2)
        await message.answer('Добро пожаловать в наш сервис!