NoReverseMatch error when following Django Tutorial

Dear every one,

I am new to Python and Django and am following the Tutorial to start my first site. But I am getting an error of NoReverseMatch error when vote. It should be redirected but error below happened.

NoReverseMatch at /polls/1/vote/

Reverse for ' results' with arguments '(1,)' and keyword arguments '{}' not found. 0 pattern(s) tried: []

Request Method:	POST
Request URL:	http://localhost:8000/polls/1/vote/
Django Version:	1.6.5
Exception Type:	NoReverseMatch
Exception Value:	Reverse for ' results' with arguments '(1,)' and keyword arguments '{}' not found. 0 pattern(s) tried: []
Exception Location:	/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/core/urlresolvers.py in _reverse_with_prefix, line 452
Python Executable:	/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python
Python Version:	2.7.6
Python Path:	['/Users/wctjerry/Dropbox/code/django/mysite', '/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip', '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7', '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin', '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac', '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages', '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk', '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old', '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload', '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages', '/Library/Python/2.7/site-packages']
Server time:	Sun, 22 Jun 2014 08:38:56 +0000

I am sure I finished namespace part in the end of Tutorial Part 3. And I checked code in Tutorial Part 4  again and again, seeming all the same. Here is my code, could any one give me some thoughts?

Thanks.

mysite/urls: http://pastebin.com/8armrsXC

polls/urls: http://pastebin.com/Tn1uFXi4

polls/views: http://pastebin.com/jhnnidQr

index.html: http://pastebin.com/S1XhmsBb

detail.html: http://pastebin.com/GTsV3D7D

results.html: http://pastebin.com/BtSf5teF

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