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 @ 00:20
Script: /wbb/register.php?sid=7648c66e0ef46d799fcb1972d72b3655
Referer: http://delftseschaaksite.nl/wbb/register.php?sid=7648c66e0ef46d799fcb1972d72b3655