poll problem

Hello everyone,
my polls application is completed. Admin part of the polls application
is running successfully
but I am facing the following error in the User part at the last,
after select a choice & click on the vote button.

NoReverseMatch at /polls/3/vote/

Reverse for 'polls.views.results' with arguments '(3L,)' and keyword
arguments '{}' not found.

please help me to solve this problem.

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