Discuz! Database Error

(1267) Illegal mix of collations (utf8_general_ci,IMPLICIT) and (utf8_unicode_ci,IMPLICIT) for operation '='
SELECT c.*,a.* FROM portal_article_kjcg c left join portal_article_metadata a on a.cgid = c.cgid where a.aid=0

PHP Debug

No.FileLineCode
1plugin.php49include(%s)
2source/plugin/page_processor/toword.inc.php38require_once(%s)
3source/plugin/page_processor/toword_ext.php16discuz_database::query(%s)
4source/class/discuz/discuz_database.php137db_driver_mysql->query(%s, false, false)
5source/class/db/db_driver_mysql.php152db_driver_mysql->halt(%s, %d, %s)
6source/class/db/db_driver_mysql.php223break()
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