Discuz! info: MySQL Query Error

Time: 2015-1-31 9:02pm
Script: /index.php

SQL: SELECT a.aid, a.attachment, a.thumb, a.remote, t.tid, t.subject
FROM [Table]attachments a
INNER JOIN [Table]threads t ON t.tid=a.tid
WHERE a.readperm='0'
AND t.displayorder>='0'
AND a.isimage IN ('1', '-1') AND a.price='0' GROUP BY a.tid
ORDER BY a.dateline DESC
LIMIT 0, 20;
Error: Sort aborted
Errno.: 1028

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