Discuz! Database Error

(13013) Filesort Rows Exceeded
select t.tid,t.subject from forum_thread t WHERE t.authorid='2203' AND t.displayorder>=0 AND t.attachment=2 ORDER BY t.dateline desc limit 3

PHP Debug

No.FileLineCode
1plugin.php47include(%s)
2source/plugin/iscwo_designer/iscwo_designer.inc.php31include(%s)
3data/template/2_iscwo_designer_iscwo_designer.tpl.php55membernewthread(%s, %d)
4source/plugin/iscwo_designer/iscwo_designer.inc.php35discuz_database::query(%s)
5source/class/discuz/discuz_database.php137db_driver_mysql->query(%s, false, false)
6source/class/db/db_driver_mysql.php152db_driver_mysql->halt(%s, %d, %s)
7source/class/db/db_driver_mysql.php223break()
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