Query Error: SELECT * FROM cms_contentindex i LEFT JOIN cms_content1 c USING(tid) WHERE i.ifpub=1 AND i.mid='1' AND cid IN(152,153,154,155) ORDER BY i.c.sort desc,i.i.postdate desc

The URL is:
/list.php?cid=152

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

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