execute_manager deprecated in Django 1.4 as part of the project layout refactor and was removed in 1.6 per the deprecation timeline: https://docs.djangoproject.com/en/1.4/internals/deprecation/#id3
To fix this error you should either install a compatible version of Django for the project or update the manage.py to new style which does not use execute_manager: https://docs.djangoproject.com/en/stable/releases/1.4/#updated-default-project-layout-and-manage-py Most likely if your manage.py is not compatible with 1.6 then neither is the rest of the project. You should find the appropriate Django version for the project.