How to fix "ERROR - No error handlers are registered, logging exception." with telegram.ext.dispatcher? - discord.py

Question

I downloaded bot which copy messages from telegram group and sending to my discord channel.
But when I am trying to send a message in a group, I am getting this error.
2022-12-31 08:25:19,877 - telegram.ext.dispatcher - ERROR - No error handlers are registered, logging exception.
Traceback (most recent call last):
File "C:\Python310\lib\site-packages\telegram\ext\dispatcher.py", line 557, in process_update
handler.handle_update(update, self, check, context)
File "C:\Python310\lib\site-packages\telegram\ext\handler.py", line 199, in handle_update
return self.callback(update, context)
File "C:\Discord-Telegram-Bot-main 1\main.py", line 46, in getTgAnnouncement
textUpdate = update.channel_post.text
AttributeError: 'NoneType' object has no attribute 'text'
I am using python 3.10
Python-telegram-bot 13.15
Below i will add the code
import requests
import json
import asyncio
import os
import json
import logging
from dotenv import load_dotenv
import discord
from discord.ext import commands
from telegram import Update
from telegram.ext import Updater,CallbackContext,MessageHandler,Filters
from telegram.utils import helpers
from telegram.ext.dispatcher import run_async
load_dotenv('token.env')
discordToken = os.getenv('DCTOKEN')# discord bot token
telegramToken = os.getenv('TGTOKEN')# telegram bot token
discordChannelId = os.getenv('DCCID')# discord announcement channel id
loop = asyncio.get_event_loop()
#--------------------------------------------------------------------------------------------------------------
bot = commands.Bot(
command_prefix="k!",
case_insensitive=True,
intents=discord.Intents.all(),
help_command=None
)
async def sendDcAnnouncement(textUpdate,nonTextUpdate):
announcementChannel = bot.get_channel(int(discordChannelId))
if textUpdate != None and nonTextUpdate != None:
await announcementChannel.send(textUpdate,file=discord.File(nonTextUpdate))
os.remove(nonTextUpdate)
elif textUpdate == None:
await announcementChannel.send(file=discord.File(nonTextUpdate))
os.remove(nonTextUpdate)
elif nonTextUpdate == None:
await announcementChannel.send(textUpdate)
def getTgAnnouncement(update: Update, context: CallbackContext):
textUpdate = None
nonTextUpdate = None
updateType = helpers.effective_message_type(update)
if updateType == 'text':
textUpdate = update.channel_post.text
else:
textUpdate = update.channel_post.caption
if updateType == 'photo':
nonTextUpdate = update.channel_post.photo[-1].get_file()['file_path']
elif updateType == 'video':
nonTextUpdate = update.channel_post.video.get_file()['file_path']
elif updateType == 'document':
nonTextUpdate = update.channel_post.document.get_file()['file_path']
elif updateType == 'voice':
nonTextUpdate = update.channel_post.voice.get_file()['file_path']
loop.create_task(sendDcAnnouncement(textUpdate,nonTextUpdate))
#bot.event
async def on_ready():
print(f'logged in as {bot.user}')
updater = Updater(token=telegramToken,use_context=True)
dispatcher = updater.dispatcher
logging.basicConfig(format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
level=logging.INFO)
getTgAnnouncement_handler = MessageHandler((~Filters.command),getTgAnnouncement)
dispatcher.add_handler(getTgAnnouncement_handler)
updater.start_polling()
bot.run(discordToken)
#--------------------------------------------------------------------------------------------------------------
I expect that this bot will send messages and that I will not get these errors.

Answer 1

MessageHandler handles all updates that have one of the fields message, edited_message, channel_post or edited_channel_post. So in getTGAnnouncement, it may very well be the case that update.channel_post is None.
If you want that handler to only handle channel_post update, please use Filters.update.channel_post.
As a side note: I see that you're using python-telegram-bot v13.x. Support for that version is ending soon in favor of the new v20.x.
Disclaimer: I'm currently the maintainer of python-telegram-bot.