Discuz! info: MySQL Query Error

Time: 2021-12-6 12:45am
Script: /forumdisplay.php

SQL: SELECT t.* FROM [Table]threads t
WHERE t.fid='48' AND t.displayorder>=0
ORDER BY t.displayorder DESC, t.lastpost DESC
LIMIT 0, 40
Error: Error writing file '/tmp/MYGuAg0q' (Errcode: 28)
Errno.: 3

Similar error report has beed dispatched to administrator before.