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: 27.07.2024 @ 01:48
Script: /wbb/usercp.php?action=buddy&add=1&sid=66a82ea2cc20611421a2dc6d43b07dbd
Referer: http://delftseschaaksite.nl/wbb/usercp.php?action=buddy&add=1&sid=66a82ea2cc20611421a2dc6d43b07dbd