I tried this bot but gets the same error everytime I try can u help me

I forked
changed repo in app.json and readme.md > heroku template
deployed ok
after I send /start in the bot
it doesn't work

got the log from heroku says some error
couldn't figure out

the log from heroku

2022-02-10T09:39:38.968173+00:00 app[api]: Enable Logplex by user (my mail)
2022-02-10T09:39:39.308412+00:00 app[api]: Release v3 created by user (my mail)
2022-02-10T09:39:39.308412+00:00 app[api]: Set API_ID, API_HASH, USER_SESSION_STRING, BOT_SESSION_NAME, BOT_TOKEN, CHANNEL_ID config vars by user (my mail)
2022-02-10T09:39:40.000000+00:00 app[api]: Build started by user (my mail)
2022-02-10T09:40:03.344974+00:00 app[api]: Deploy by user (my mail)
2022-02-10T09:40:03.344974+00:00 app[api]: Release v4 created by user (my mail)
2022-02-10T09:40:12.000000+00:00 app[api]: Build succeeded
2022-02-10T09:40:13.287069+00:00 app[api]: Scaled to worker@1:Free by user (my mail)
2022-02-10T09:40:16.558901+00:00 heroku[worker.1]: Starting process with command `python3 main.py`
2022-02-10T09:40:17.357949+00:00 heroku[worker.1]: State changed from starting to up
2022-02-10T09:42:13.109141+00:00 app[worker.1]: 'NoneType' object has no attribute 'write'
2022-02-10T09:42:13.109152+00:00 app[worker.1]: Traceback (most recent call last):
2022-02-10T09:42:13.109153+00:00 app[worker.1]: File "/app/.heroku/python/lib/python3.9/site-packages/pyrogram/dispatcher.py", line 222, in handler_worker
2022-02-10T09:42:13.109154+00:00 app[worker.1]: await handler.callback(self.client, *args)
2022-02-10T09:42:13.109155+00:00 app[worker.1]: File "/app/main.py", line 30, in start_handler
2022-02-10T09:42:13.109156+00:00 app[worker.1]: await event.reply_text(
2022-02-10T09:42:13.109158+00:00 app[worker.1]: File "/app/.heroku/python/lib/python3.9/site-packages/pyrogram/types/messages_and_media/message.py", line 918, in reply_text
2022-02-10T09:42:13.109158+00:00 app[worker.1]: return await self._client.send_message(
2022-02-10T09:42:13.109159+00:00 app[worker.1]: File "/app/.heroku/python/lib/python3.9/site-packages/pyrogram/methods/messages/send_message.py", line 128, in send_message
2022-02-10T09:42:13.109159+00:00 app[worker.1]: r = await self.send(
2022-02-10T09:42:13.109159+00:00 app[worker.1]: File "/app/.heroku/python/lib/python3.9/site-packages/pyrogram/methods/advanced/send.py", line 77, in send
2022-02-10T09:42:13.109160+00:00 app[worker.1]: r = await self.session.send(
2022-02-10T09:42:13.109160+00:00 app[worker.1]: File "/app/.heroku/python/lib/python3.9/site-packages/pyrogram/session/session.py", line 362, in send
2022-02-10T09:42:13.109160+00:00 app[worker.1]: return await self._send(data, timeout=timeout)
2022-02-10T09:42:13.109160+00:00 app[worker.1]: File "/app/.heroku/python/lib/python3.9/site-packages/pyrogram/session/session.py", line 291, in _send
2022-02-10T09:42:13.109161+00:00 app[worker.1]: message = self.msg_factory(data)
2022-02-10T09:42:13.109161+00:00 app[worker.1]: File "/app/.heroku/python/lib/python3.9/site-packages/pyrogram/session/internals/msg_factory.py", line 37, in __call__
2022-02-10T09:42:13.109162+00:00 app[worker.1]: len(body)
2022-02-10T09:42:13.109162+00:00 app[worker.1]: File "/app/.heroku/python/lib/python3.9/site-packages/pyrogram/raw/core/tl_object.py", line 76, in __len__
2022-02-10T09:42:13.109162+00:00 app[worker.1]: return len(self.write())
2022-02-10T09:42:13.109162+00:00 app[worker.1]: File "/app/.heroku/python/lib/python3.9/site-packages/pyrogram/raw/functions/messages/send_message.py", line 131, in write
2022-02-10T09:42:13.109163+00:00 app[worker.1]: b.write(self.reply_markup.write())
2022-02-10T09:42:13.109163+00:00 app[worker.1]: File "/app/.heroku/python/lib/python3.9/site-packages/pyrogram/raw/types/reply_inline_markup.py", line 66, in write
2022-02-10T09:42:13.109163+00:00 app[worker.1]: b.write(Vector(self.rows))
2022-02-10T09:42:13.109163+00:00 app[worker.1]: File "/app/.heroku/python/lib/python3.9/site-packages/pyrogram/raw/core/primitives/vector.py", line 58, in __new__
2022-02-10T09:42:13.109163+00:00 app[worker.1]: + [cast(bytes, t(i)) if t else i.write() for i in value]
2022-02-10T09:42:13.109163+00:00 app[worker.1]: File "/app/.heroku/python/lib/python3.9/site-packages/pyrogram/raw/core/primitives/vector.py", line 58, in
2022-02-10T09:42:13.109163+00:00 app[worker.1]: + [cast(bytes, t(i)) if t else i.write() for i in value]
2022-02-10T09:42:13.109164+00:00 app[worker.1]: File "/app/.heroku/python/lib/python3.9/site-packages/pyrogram/raw/types/keyboard_button_row.py", line 66, in write
2022-02-10T09:42:13.109164+00:00 app[worker.1]: b.write(Vector(self.buttons))
2022-02-10T09:42:13.109164+00:00 app[worker.1]: File "/app/.heroku/python/lib/python3.9/site-packages/pyrogram/raw/core/primitives/vector.py", line 58, in __new__
2022-02-10T09:42:13.109164+00:00 app[worker.1]: + [cast(bytes, t(i)) if t else i.write() for i in value]
2022-02-10T09:42:13.109164+00:00 app[worker.1]: File "/app/.heroku/python/lib/python3.9/site-packages/pyrogram/raw/core/primitives/vector.py", line 58, in
2022-02-10T09:42:13.109164+00:00 app[worker.1]: + [cast(bytes, t(i)) if t else i.write() for i in value]
2022-02-10T09:42:13.109164+00:00 app[worker.1]: AttributeError: 'NoneType' object has no attribute 'write'

I'm a newbie
help me please