Query Error: SELECT * FROM cms_contentindex i RIGHT JOIN cms_content3 c USING(tid) WHERE i.ifpub=1 and i.cid>0 AND i.mid='3' AND cid IN(414) ORDER BY c.sort desc,i.postdate desc LIMIT 0,23

The URL is:
http://yy.voc.com.cn/list.php?cid=414

MySQL server error:
Unknown column 'c.sort' in 'order clause' ( 1054 )

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