[Answered ]-Django 1.3 with Webassets 0.7: assets.py ignored?

A project-wide assets.py (as opposed to one in an app-directory) is no longer automatically read, you need to define such files through a ASSETS_MODULES setting now.

If you are using staticfiles, pay attention to the fact that the staticfile finders will not be used unless Django is in debug mode (settings.DEBUG=True). In production mode, webassets will assume that collectstatic has been run first.

In settings.DEBUG=True mode, the reverse is true: ONLY the Django staticfile finders will be used. You could try opening a shell (./manage.py shell) and see if the following finds your file:

 from django.contrib.staticfiles import finders
 finders.find('styles/libs/jquery-ui-timepicker-addon.css')

If it does, then so should webassets.

I had a similar error arise

'[BUNDLE_NAME]' not found (using staticfiles finders)

This wasn’t a very helpful message, so ended up looking into ./manage.py shell and running

>>> from django.conf import settings
>>> from [ASSETS_FILE_PATH.assets] import [BUNDLE_NAME]
>>> [BUNDLE_NAME]

If this isn’t there it may give you another message.