Creating a book review custom content type with simple Fivestar rating

Good day,

I'm trying to create a simple book review content type that includes the Fivestar rating widget. I have followed the documentation section steps 1 and 2 located here, Configuration as a CCK field / Advanced Rating, which worked out fine but I'm totally clueless as to what I need to include in step 3 as far as php code or other. I imagine I would want the node ID (or other?) to be the new book review page I am actually creating is my guess, but do not know enough php yet to have it do this dynamically.

When I do a preview it almost works the way I want, with the rating widget showing up above the text and all, and 'locked'. But when trying to save I get the following error, (I must not have something defined correctly in step 3 is my guess):
Fatal error: Call to undefined function fivestar_content_is_empty() in C:\wamp\www\drupal-6.4\sites\all\modules\cck\content.module on line 760

Thanks in advance for your help! I'll be happy to document this for others to use if we can figure this out. My mid to long-term goal is to eventually have a book rating system similar to what amazon.com uses, but for now a simple book review rating completed by the review author would I think be very useful. Could be used for anything; videos, pictures, etc.