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In django-braces 1.3, views exported AccessMixin but in django-braces 1.4 this was moved to views._access and not exported in views.
This should be fixed in versions>1.4
Another workaround for this error is to downgrade django-braces to version 1.3.1.
Checkout this github issue: https://github.com/pydanny/django-admin2/issues/396
Source:stackexchange.com