NoReverseMatch: Reverse for '"locksmith.views.about"' with arguments '()' and keyword arguments '{}' not found.

[yks0000]

While accessing the app on http://127.0.0.1:8000/, I am getting below error. Please suggest.

python manage.py runserver

Validating models...

0 errors found
Django version 1.4.3, using settings 'locksmith.settings'
Development server is running at http://127.0.0.1:8000/
Quit the server with CONTROL-C.
/usr/local/lib/python2.7/dist-packages/tastypie/api.py:82: UserWarning: 'override_urls' is a deprecated method & will be removed by v1.0.0. Please use prepend_urls instead.
warnings.warn("'override_urls' is a deprecated method & will be removed by v1.0.0. Please use prepend_urls instead.")
ERROR 2015-05-04 09:39:26,682 base 21215 139770026850048 Internal Server Error: /
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py", line 111, in get_response
response = callback(request, _callback_args, *_callback_kwargs)
File "/home/yogesh/yogeshsharma_SD/wiki/locksmith/locksmith/views.py", line 29, in index
context_instance=RequestContext(request))
File "/usr/local/lib/python2.7/dist-packages/django/shortcuts/init.py", line 20, in render_to_response
return HttpResponse(loader.render_to_string(_args, *_kwargs), **httpresponse_kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/template/loader.py", line 176, in render_to_string
return t.render(context_instance)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py", line 140, in render
return self._render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py", line 134, in _render
return self.nodelist.render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py", line 823, in render
bit = self.render_node(node, context)
File "/usr/local/lib/python2.7/dist-packages/django/template/debug.py", line 74, in render_node
return node.render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/loader_tags.py", line 123, in render
return compiled_parent._render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py", line 134, in _render
return self.nodelist.render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py", line 823, in render
bit = self.render_node(node, context)
File "/usr/local/lib/python2.7/dist-packages/django/template/debug.py", line 74, in render_node
return node.render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/defaulttags.py", line 424, in render
raise e
NoReverseMatch: Reverse for '"locksmith.views.about"' with arguments '()' and keyword arguments '{}' not found.
INFO 2015-05-04 09:39:26,683 base 21215 139770026850048 Raven is not configured (disabled). Please see documentation for more information.
[04/May/2015 09:39:26] "GET / HTTP/1.1" 500 217741