An ImproperlyConfigured from ROOT_URLCONF points to wrong module; what fix in settings.py, and why restart server after?
Set ROOT_URLCONF = 'project.urls'; restart clears cache for new patterns.
Set ROOT_URLCONF = 'app.urls'; no restart, as configs load dynamically.
Add to INSTALLED_APPS; restart for view imports only.
Run makemigrations; restart for DB sync.
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Python | Django URLs