SQL-DATABASE ERROR

Database error in WoltLab Burning Board: Link-ID == false, connect failed
mysql error: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
mysql error number: 2002
Date: 21.05.2024 @ 00:45
Script: /wbb/usercp.php?action=buddy&add=34&sid=d8e4f8cd4e47505259d5eab93bf14f0c
Referer: http://www.delftseschaaksite.nl/wbb/usercp.php?action=buddy&add=34&sid=d8e4f8cd4e47505259d5eab93bf14f0c