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=158&sid=82c116ed6d420121f406b726d62ea7ab
Referer: