1572:20150521:180702.442 Starting Zabbix Server. Zabbix 2.4.3 (revision 51175).
  1572:20150521:180702.443 using configuration file: /etc/zabbix/zabbix_server.conf
  1572:20150521:180702.476 current database version (mandatory/optional): 02010032/02010032
  1572:20150521:180702.476 required mandatory version: 02040000
  1572:20150521:180702.476 starting automatic database upgrade
  1572:20150521:180702.477 [Z3005] query failed: [1054] Unknown column 'value_changed' in 'where clause' [delete from events where source=0 and object=0 and (value=2 or value_changed=0)]
  1572:20150521:180702.477 database upgrade failed