You do not appear to have a ost_ticket_event table. You should make one.DROP TABLE IF EXISTS `%TABLE_PREFIX%ticket_event`;CREATE TABLE `%TABLE_PREFIX%ticket_event` ( `ticket_id` int(11) unsigned NOT NULL default '0', `staff_id` int(11) unsigned NOT NULL, `team_id` int(11) unsigned NOT NULL, `dept_id` int(11) unsigned NOT NULL, `topic_id` int(11) unsigned NOT NULL, `state` enum('created','closed','reopened','assigned','transferred','overdue') NOT NULL, `staff` varchar(255) NOT NULL default 'SYSTEM', `timestamp` datetime NOT NULL, KEY `ticket_state` (`ticket_id`, `state`, `timestamp`), KEY `ticket_stats` (`timestamp`, `state`)) DEFAULT CHARSET=utf8;