Wario Land: Shake It

Fatal error: Uncaught Error: Call to undefined function similar_posts() in /home/dude/public_html/wp-content/themes/logothetis/comments.php:1 Stack trace: #0 /home/dude/public_html/wp-includes/comment-template.php(1532): require() #1 /home/dude/public_html/wp-content/themes/logothetis/index.php(33): comments_template() #2 /home/dude/public_html/wp-includes/template-loader.php(106): include('/home/dude/publ...') #3 /home/dude/public_html/wp-blog-header.php(19): require_once('/home/dude/publ...') #4 /home/dude/public_html/index.php(17): require('/home/dude/publ...') #5 {main} thrown in /home/dude/public_html/wp-content/themes/logothetis/comments.php on line 1