URL code not getting resolved in Part 4 of Tutorial

After switching to "generic views", the link on my "polls" index page looks like this:

<a href="{% url 'polls:detail' poll.id }/">What's up?</a>

Before I switched to the generic views code, all was working fine. To do the swithc, I simply cut and pasted the code from the Part 4 page to my pages (polls/urls.py and  polls/views.py,according to https://docs.djangoproject.com/en/1.5/intro/tutorial04/).  Now, of course, when I click on the link, I get an error.

Any suggestions would be much appreciated.

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