Query Error: SELECT tid FROM buddh_threads USE INDEX (postdate) WHERE fid= '2' AND topped=0 AND ifcheck=1 ORDER BY postdate DESC LIMIT 0,500

The URL Is:
http://buddh.cn/bbs/m/forum.php?fid=2&type=new

MySQL Server Error:
Key 'postdate' doesn't exist in table 'buddh_threads' ( 1176 ) 查看错误相关信息

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