raise ValueError('%r does not appear to be an IPv4 or IPv6 address' % ValueError: 'api.telegram.org' does not appear to be an IPv4 or IPv6 address

Question

import signal from telegram import Update
from telegram.ext import ApplicationBuilder, CommandHandler, ContextTypes

async def hello(update, context):
    await update.message.reply_text(f'Hello {update.effective_user.first_name}')

app = ApplicationBuilder().token("5357948376:AAG3LEWIYTFA1oTSYiRztOzsniv4BTySaB4").build()

app.add_handler(CommandHandler("hello", hello))

app.run_polling(stop_signals=None)