django not finding app

Question

I am getting a import error in django. My main urls.py settings file is located at main/main/urls.py my module or app is located here main/apps/builder/urls.py.

traceback error

ImportError at /
No module named apps.builder.urls
Request Method: GET
Request URL:    ***************
Django Version: 1.4
Exception Type: ImportError
Exception Value:    
No module named apps.builder.urls
Exception Location: /usr/lib/python2.6/site-packages/django/utils/importlib.py in     import_module, line 35
Python Executable:  /usr/bin/python26
Python Version: 2.6.0
Python Path:    
['/home/pycode/main',
 '/usr/lib/python26.zip',
 '/usr/lib/python2.6',
 '/usr/lib/python2.6/plat-linux2',
 '/usr/lib/python2.6/lib-tk',
 '/usr/lib/python2.6/lib-old',
 '/usr/lib/python2.6/lib-dynload',
 '/usr/lib/python2.6/site-packages']
Server time:    Tue, 12 Jun 2012 12:39:17 -0500

main/main/urls.py

from django.conf.urls import patterns, include, url

urlpatterns = patterns('',
    url(r'^$', include('main.apps.builder.urls')),
)

Answer 1

Your apps module must be below main/main or you have to make sure your apps folder is in your sys.path, probably best to set PYTHONPATH.

Answer 2

Did you add it to INSTALLED_APPS in your settings.py file?

https://docs.djangoproject.com/en/dev/ref/settings/#installed-apps

also as ramdaz suggested each directory needs a __init__.py file even if it is empty.