Discuz! Database Error

(1054) Unknown column 'zan' in 'field list'
SELECT uid,zan FROM micxp_expert ORDER BY zan DESC

PHP Debug

No.FileLineCode
1home.php24discuz_application->init()
2source/class/discuz/discuz_application.php70discuz_application->_init_cron()
3source/class/discuz/discuz_application.php544discuz_cron::run()
4source/class/discuz/discuz_cron.php48include(%s)
5source/plugin/micxp_expert/cron/cron_expert_daily.php10table_micxp_expert->get_uids()
6source/plugin/micxp_expert/table/table_micxp_expert.php41discuz_database::fetch_all(%s, Array)
7source/class/discuz/discuz_database.php100discuz_database::query(%s, Array, false, false)
8source/class/discuz/discuz_database.php136db_driver_mysql->query(%s, false, false)
9source/class/db/db_driver_mysql.php153db_driver_mysql->halt(%s, %d, %s)
10source/class/db/db_driver_mysql.php224break()
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