Missing argument 2 for wpdb::prepare()

Hi,

Anyone can help me. my error

Warning: Missing argument 2 for wpdb::prepare(), called in /home/ilike4js/public_html/kainsutera/wp-content/plugins/facebook-ecommerce-shop/lib/scripts/facebook/saveuser.php on line 44 and defined in /home/ilike4js/public_html/kainsutera/wp-includes/wp-db.php on line 990

My file (saveuser.php)

line 44 :
$user = self::$db->get_row(self::$db->prepare( “SELECT * FROM ” . ( self::$db->posts ) .” WHERE 1=1 and post_title='” . ($fbk_user) . “‘ and post_type=’aashopcustomer’ limit 0, 1”));