python-telegram-bot error when in Channel

Question

I just finished creating my first bot and it works perfectly in groups and when I message it, however, when I add it to a Channel and give it all permissions it does not work. The echo message function gives an error of caused error 'NoneType' object has no attribute 'text' .

from telegram.ext import Updater, CommandHandler, MessageHandler, Filters
from telegram import MessageEntity, InlineQueryResultArticle, InputTextMessageContent

def echo(update, context): # this is from the documentation
    context.bot.send_message(chat_id=update.effective_chat.id, text=update.message.text)

def error(update, context):
    print(f'Error {update} caused error {context.error}')

def main():
    updater = Updater(API)
    dp = updater.dispatcher
    
    #Echo message
    echo_handler = MessageHandler(Filters.text & (~Filters.command), echo)
    dp.add_handler(echo_handler)

    #Handle errors
    dp.add_error_handler(error)

    updater.start_polling()
    updater.idle()

main()

Answer 1

For channel posts it's update.channel_post not update.message.text . Alternatively, update.effective_message can be used if you don't want to differentiate between channel posts, messages and edited messages/channel posts.

def echo(update, context):
    context.bot.send_message(
    chat_id=update.effective_chat.id, text=update.effective_message)