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 @ 08:13
Script: /wbb/usercp.php?action=buddy&add=29&sid=19c9c3c1a497dc9bd76e0f8ed64cafe0
Referer: http://delftseschaaksite.nl/wbb/usercp.php?action=buddy&add=29&sid=19c9c3c1a497dc9bd76e0f8ed64cafe0