civicrm/civicrm-core — pull request #1871 by pratik-joshi (2013-10-29 15:13:53+00:00)
Title: 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

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* CRM-13667: WP Sync Users Error
http://issues.civicrm.org/jira/browse/CRM-13667