[Plugin: Yet Another Related Posts Plugin] Fatal error: Call to undefined function: wp_related_posts

This plug-in would be absolutely perfect if it worked, but it’s not at the moment. I hope I can get some support and get this up and running. The features are amazing!

I’m getting this error:

Fatal error: Call to undefined function: wp_related_posts() in /home/content/c/o/l/collegemovie/html/wp-content/themes/dreamworks_redux1.4/single.php on line 49

Any ideas? I just installed it and selected a few options to get the most general amount of related posts possible.

http://www.collegeisamovie.com/?p=427