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 @ 07:11
Script: /wbb/usercp.php?action=buddy&add=15&sid=6c44a1dd4e3783d5654d9f2f5ce717de
Referer: http://delftseschaaksite.nl/wbb/usercp.php?action=buddy&add=15&sid=6c44a1dd4e3783d5654d9f2f5ce717de