CRM-13667

as per the patch mentioned in forum link : http://forum.civicrm.org/index.php/topic,29754.0.html 

This warning was introduced after wordpress 3.5 release : 

http://make.wordpress.org/core/2012/12/12/php-warning-missing-argument-2-for-wpdb-prepare/
http://wordpress.org/support/topic/warning-missing-argument-2-for-wpdbprepare-3

----------------------------------------
* CRM-13667: WP Sync Users Error
  http://issues.civicrm.org/jira/browse/CRM-13667