South django.db.utils.IntegrityError: django_content_type.name may not be NULL while running unit tests

Question

I'm getting this error django.db.utils.IntegrityError: django_content_type.name may not be NULL while running tests via nosetest.

I've done everything as told in south tutorial - initial migration, fake migration etc. Running site normally via runserver command works like charm, but while using test command - above error.

Also, In my development enviroment I'm using sqlite database and I'm using django-nose as test runner (at the very end of INSTALLED_APPS.

Any clues?