AttributeError: ‘Settings’ object has no attribute ‘ROOT_URLCONF’

From django docs:

A Django settings file contains all the configuration of your Django installation.
When you use Django, you have to tell it which settings you’re using.
Do this by using an environment variable, DJANGO_SETTINGS_MODULE.

The value of DJANGO_SETTINGS_MODULE should be in Python path syntax,
e.g. mysite.settings. Note that the settings module should be on the
Python import search path.

And

ROOT_URLCONF

Default: Not defined

A string representing the full Python import path to your root
URLconf. For example: “mydjangoapps.urls”. Can be overridden on a
per-request basis by setting the attribute urlconf on the incoming
HttpRequest object. See How Django processes a request for details.