AthleticFoodie Design Error: 'css' is undefined

Triggered by: layout/old/head.html (line 10)

  8. {{ store | ogp_tags(page_title) }}
  9. 
> 10. {{ css.base() }}
  11. {% set mycss = 'css/athleticfoodie8.css' %}
  12. {{ mycss | asset_url | stylesheet_tag }}

Stack Trace:

Traceback (most recent call last):
  File "./cratejoy/theme/render.py", line 316, in render_page
    output = tpl.render(**kwargs)
  File "/home/ubuntu/cratejoy/venv/local/lib/python2.7/site-packages/jinja2/environment.py", line 969, in render
    return self.environment.handle_exception(exc_info, True)
  File "/home/ubuntu/cratejoy/venv/local/lib/python2.7/site-packages/jinja2/environment.py", line 742, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "old_html/base.html", line 5, in top-level template code
  File "layout/old/head.html", line 10, in top-level template code
  File "/home/ubuntu/cratejoy/venv/local/lib/python2.7/site-packages/jinja2/sandbox.py", line 330, in getattr
    value = getattr(obj, attribute)
UndefinedError: 'css' is undefined

PSST: If you are the owner of this store, fix this error from the code editor. See the developer documentation for more information.