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 @ 01:59
Script: /wbb/register.php?sid=d54579da8f6c761735ba9b8a27c2b48c
Referer: http://www.delftseschaaksite.nl/wbb/register.php?sid=d54579da8f6c761735ba9b8a27c2b48c