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 @ 00:15
Script: /wbb/usercp.php?action=buddy&add=91&sid=8a9cfb21764b6b5b78bc7109ebe1652c
Referer: http://www.delftseschaaksite.nl/wbb/usercp.php?action=buddy&add=91&sid=8a9cfb21764b6b5b78bc7109ebe1652c