Changes to the number of words excerpted or including <p> or br tags in the recent post triggers this error message:
Catchable fatal error: Object of class WP_Error could not be converted to string in /home/content/38/9022138/html/stvincent/wp-content/plugins/recent-posts-slider/recent-posts-slider.php on line 184
http://wordpress.org/extend/plugins/recent-posts-slider/