Can't get respond properly

[ghost]

Greeting, thank you for your wonderful work! Currently, I'm writing a telegram bot using flask and webhook for my company.
I found your bot and it's easy to understand. However, when I try to run and test the POST method (with Postman), I received:

 * Serving Flask app 'app' (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: off
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
[2021-12-27 23:07:30,019] ERROR in app: Exception on /<bot-token-not-shown> [POST]
Traceback (most recent call last):
  File "D:\Anaconda3\envs\XXXXX\lib\site-packages\flask\app.py", line 2073, in wsgi_app
    response = self.full_dispatch_request()
  File "D:\Anaconda3\envs\XXXXX\lib\site-packages\flask\app.py", line 1518, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "D:\Anaconda3\envs\XXXXX\lib\site-packages\flask\app.py", line 1516, in full_dispatch_request
    rv = self.dispatch_request()
  File "D:\Anaconda3\envs\XXXXX\lib\site-packages\flask\app.py", line 1502, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
  File "G:\XXXXX\flask-telegram-bot\app.py", line 17, in respond
    update = telegram.Update.de_json(request.get_json(force=True), bot)
  File "D:\Anaconda3\envs\XXXXX\lib\site-packages\telegram\update.py", line 416, in de_json
    return cls(**data)
TypeError: __init__() missing 1 required positional argument: 'update_id'

I'm using Python 3.8 and python-telegram-bot 13.9

[ghost]

I've even tried to create a new Anaconda environment with Python 3.6 and done pip install -r requirements.txt but it seems that the problem still happens:

  File "/home/ubuntu/anaconda3/envs/XXXXX/lib/python3.6/site-packages/telegram/update.py", line 219, in de_json
    return cls(**data)
TypeError: __init__() missing 1 required positional argument: 'update_id'

p/s: I tried to run on both OSes: Windows 11 (my PC at home) and Linux (the company PC)

[ghost]

Not sure how to fix this bug. However, I've found that: when I tried to call /getUpdates from the api.telegram.org, it said:

{"ok":false,"error_code":409,"description":"Conflict: can't use getUpdates method while webhook is active; use deleteWebhook to delete the webhook first"}

Therefore, I understood my problem - missing the 'update_id' (since the telegram bot couldn't retrieve the getUpdates info successfully). I think the webhook shouldn't be actived before the getUpdates method is called. How can I fix this?