Runtime Error unable to solve from forums/ FAQ.

[l_sharma]

I am trying to make connection with MS SQL with following settings

DATABASES = {
    'default': {
        'ENGINE': 'sql_server.pyodbc',
        'NAME': 'dbName',
        'USER': 'userName',
        'PASSWORD': 'password',
        'HOST':'hostName',
        'PORT': 1433,
        'OPTIONS': {
            'driver': "SQL Server"
        }
    }
}

I had to downgrade to : pip install 'django-pyodbc-azure<1.11' which was otherwise giving me a error of No Server/DSN found. However after downgrading when I execute "python manage.py makemigrations" or python manage.py runserver.

Following is my error, which I am unable to understand. Any help would be of great help.
Thanks in advance.

(venv) C:\Users\L_Sharma\PycharmProjects\Test1>python manage.py makemigrations
Traceback (most recent call last):
  File "manage.py", line 21, in <module>
    main()
  File "manage.py", line 17, in main
    execute_from_command_line(sys.argv)
  File "C:\Users\L_Sharma\PycharmProjects\Test1\venv\lib\site-packages\django\core\management\__init__.py", line 367, in execute_from_command_line
    utility.execute()
  File "C:\Users\L_Sharma\PycharmProjects\Test1\venv\lib\site-packages\django\core\management\__init__.py", line 341, in execute
    django.setup()
  File "C:\Users\L_Sharma\PycharmProjects\Test1\venv\lib\site-packages\django\__init__.py", line 27, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "C:\Users\L_Sharma\PycharmProjects\Test1\venv\lib\site-packages\django\apps\registry.py", line 108, in populate
    app_config.import_models(all_models)
  File "C:\Users\L_Sharma\PycharmProjects\Test1\venv\lib\site-packages\django\apps\config.py", line 199, in import_models
    self.models_module = import_module(models_module_name)
  File "C:\Users\L_Sharma\AppData\Local\Programs\Python\Python38-32\lib\importlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 783, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "C:\Users\L_Sharma\PycharmProjects\Test1\venv\lib\site-packages\django\contrib\auth\models.py", line 4, in <module>
    from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
  File "C:\Users\L_Sharma\PycharmProjects\Test1\venv\lib\site-packages\django\contrib\auth\base_user.py", line 52, in <module>
    class AbstractBaseUser(models.Model):
RuntimeError: __class__ not set defining 'AbstractBaseUser' as <class 'django.contrib.auth.base_user.AbstractBaseUser'>. Was __classcell__ propagated to type.__new__?

[Mariusz Felisiak]

First of all django-pyodbc-azure < 1.11 is not compatible with Django 3.0, secondly it's a 3rd-party package so it's not an issue in Django itself, and finally, please don't use trac as a support channel.

[Andrew Badr]

Commenting in case this helps anyone else. I hit this same error trying to upgrade a simple Django 1.9.13 project from python 2.7 to python 3.8.

RuntimeError: __class__ not set defining 'AbstractBaseUser' as <class 'django.contrib.auth.base_user.AbstractBaseUser'>. Was __classcell__ propagated to type.__new__?

Not using django-pyodbc-azure or anything else unusual. This error seems be coming from within Django itself.(File "/app/.heroku/python/lib/python3.8/site-packages/django/contrib/auth/base_user.py", line 49). What's strange is that the error doesn't happen for my locally, only on Heroku.

Upgrading to Django 1.11 fixed the issue.