Reproduction steps:

1. Initialise the test project, creating the super-user along the way:

      cd testproject/
      ./manage.py syncdb && ./manage.py migrate

2. Run the development server:

      ./manage.py runserver

3. Access the website via http://localhost:8000/

4. Click on the Add project button.

Expected results:

1. Form is shown for providing information about the new project.

Actual results:

1. Error is reported instead:

      TemplateSyntaxError at /conntrackt/project/add/
   
      'crispy_forms_tags' is not a valid tag library: ImportError raised loading crispy_forms.templatetags.crispy_forms_tags: No module named lru_cache
   
      Request Method:  GET
      Request URL:     http://localhost:8000/conntrackt/project/add/
      Django Version:  1.5.12
      Exception Type:  TemplateSyntaxError
      Exception Value:
   
      'crispy_forms_tags' is not a valid tag library: ImportError raised loading crispy_forms.templatetags.crispy_forms_tags: No module named lru_cache
   
      Exception Location:  REDACTED/conntrackt/local/lib/python2.7/site-packages/django/template/defaulttags.py in load, line 1046
      Python Executable:   REDACTED/conntrackt/bin/python
      Python Version:  2.7.13
      Python Path: REDACTED
      Server time:     Wed, 20 Dec 2017 15:02:14 +0100

Additional notes:

The error probably comes from too new of a version of django-crispy-forms. Reverting to 1.6.x version makes the error go away.