New installation returns the following error code on Directory Page

Warning: Missing argument 2 for wpdb::prepare(), called in /home/merpaloo/public_html/wp-content/plugins/ldd-business-directory/lddbd_display.php on line 471 and defined in /home/merpaloo/public_html/wp-includes/wp-db.php on line 992

Set up categories and tested with one listing and this error appears at the top of the designated directory page. http://mer-palooza.com/merdirectory-international-mermaid-directory-suppliers-vendors-talent/

line 992 of wp-db.php is the following:

function prepare( $query, $args ) {
if ( is_null( $query ) )
return;

I do not see where that correlates with line 471 of lddbd_display.php

Any suggestions or help please?

http://wordpress.org/plugins/ldd-business-directory/