[Plugin: Yet Another Related Posts Plugin] Widget – Fatal error: Call to a member function have_pos

When i want to use templet with tuhumbnails i get this error message in the widnow where the code should be – on the settings page of YARRP
Ofcourse thumbs are not showing

Fatal error: Call to a member function have_posts() on a non-object in /wp-content/themes/newscast2/yarpp-template-thumbnail.php on line 7

What can i do

http://wordpress.org/extend/plugins/yet-another-related-posts-plugin/