Ошибка при отправке сообщения в телеграм чат с помощью python telethon

from telethon import TelegramClient


client = TelegramClient('anon', api_id, api_hash)
async def main():
    await client.send_message(chat_id, 'Hello')


with client:
    client.loop.run_until_complete(main())

При попытке запустить код получаю ошибку:

telethon.errors.rpcerrorlist.ChatIdInvalidError: Invalid object ID for a chat. Make sure to pass the right types, for instance making sure that the request is designed for chats (not channels/megagroups) or otherwise look for a different one more suited\nAn example working with a megagroup and AddChatUserRequest, it will fail because megagroups are channels. Use InviteToChannelRequest instead (caused by SendMessageRequest)

chat_id правильный, я проверял. В чем может быть проблема?