Discuz! info: MySQL Query Error

Time: 2021-12-6 12:51am
Script: /forumdisplay.php

SQL: SELECT t.* FROM [Table]threads t
WHERE t.fid='99' AND t.displayorder IN (0, 1)
ORDER BY displayorder DESC, lastpost DESC
LIMIT 38
Error: Error writing file '/tmp/MYBXvnIz' (Errcode: 28)
Errno.: 3

Similar error report has beed dispatched to administrator before.