ImproperlyConfigured: cannot import name RegistrationFormTermsOfService

Django’s django-registration version 3 introduces a new class, RegistrationFormTermsOfService, that replaces the tos field in RegistrationForm.

Our app had done that but django-registration’s version change slipped past me (so I had django-registration, just the wrong version), easily fixed with a svn -co http://django-registration.googlecode.com/svn/trunk/registration/ into site-packages.