SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Link-ID == false, connect failed
mysql error: No such file or directory
mysql error number: 2002
mysql version: unknown
php version: 5.6.40-nmm8
Date: 16.05.2024 @ 05:29
Script: /xforum/usercp.php?action=buddy&add=3142&sid=82c2773806f29883b64a67e2c7278e3a
Referer: