No module named 'blog'

hi all,

would like to seek for everyone's help.

I am following the django girls instruction => http://tutorial.djangogirls.org/en/django_urls/index.html#your-first-django-url, but encounter the problem. 

when I connect to 127.0.0.1:8000, I got the No module named 'blog' response.

Here's the message on browser.

**************

ImportError at /

No module named 'blog'

Request Method:	GET
Request URL:	http://127.0.0.1:8000/
Django Version:	1.8
Exception Type:	ImportError
Exception Value:	No module named 'blog'
Exception Location:	/usr/lib/python3.4/importlib/__init__.py in import_module, line 109
Python Executable:	/home/maggie/djangoanywhere/venv/bin/python
Python Version:	3.4.0
Python Path:	['/home/maggie/djangoanywhere', '/usr/lib/python3.4', '/usr/lib/python3.4/plat-x86_64-linux-gnu', '/usr/lib/python3.4/lib-dynload', '/home/maggie/djangoanywhere/venv/lib/python3.4/site-packages']
Server time:	Mon, 10 Aug 2015 00:47:53 +0800

**************

This issue occurred when I add url(r'', include('blog.urls')), into magsite/url.py

**************

url.py

**************

from django.conf.urls import include, url

from django.contrib import admin

urlpatterns = [

    url(r'^admin/', include(admin.site.urls)),

    url(r'', include('blog.urls')),

]

**************

Any idea about the root cause? :(

and any response will be appreciate.

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