Debugging HTML

On one of my websites, this HTML appears at the top of the page on all but the home page:

Warning: Missing argument 2 for wpdb::prepare(), called in /home2/mattwell/public_html/firstclassdesigners.com/wp-content/themes/nemesis/plugins/post-types-order/post-types-order.php on line 168 and defined in /home2/mattwell/public_html/firstclassdesigners.com/wp-includes/wp-db.php on line 992

Warning: Missing argument 2 for wpdb::prepare(), called in /home2/mattwell/public_html/firstclassdesigners.com/wp-content/themes/nemesis/plugins/post-types-order/post-types-order.php on line 239 and defined in /home2/mattwell/public_html/firstclassdesigners.com/wp-includes/wp-db.php on line 992

I have checked in the wp-db.php file and it says debugging is off. How do I fix or get rid of this?

Thanks in advance,

Matthew