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 @ 02:12
Script: /wbb/register.php?sid=89dd9c0c62e73d1e7a35dc5423a2fe3e
Referer: http://delftseschaaksite.nl/wbb/register.php?sid=89dd9c0c62e73d1e7a35dc5423a2fe3e