SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.5): Invalid SQL: SELECT r.*, g.title FROM bb1_ranks r LEFT JOIN bb1_groups g USING(groupid) ORDER BY g.showorder ASC, r.groupid DESC, r.needposts ASC
mysql error: Can't create/write to file '/var/tmp/mysql.awI5wo/#sql_2941_0.MAI' (Errcode: 2)
mysql error number: 1
mysql version: 5.5.33-MariaDB
php version: 5.6.19
Date: 10.05.2024 @ 17:37
Script: /misc.php?action=faq1&sid=5f8d39052edab0a04f0e9c849050e14c
Referer: