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 @ 07:53
Script: /wbb/usercp.php?action=buddy&add=4&sid=838ddfefd35b2cbc2cc55f46f7ae3a28
Referer: http://www.delftseschaaksite.nl/wbb/usercp.php?action=buddy&add=4&sid=838ddfefd35b2cbc2cc55f46f7ae3a28