I have a website with a blog. I am using the WP plugin keywords to websites. It comes with a couple of themes that work fine. When I try to install Socrates I get the following error:

Fatal error: Call to undefined function body_class() in /home/fishing/public_html/blog/wp-content/themes/socrates/header.php on line 104

Has anyone else encountered this? Work around? Fix? Suggestions?

Thanks in advance.