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 @ 00:37
Script: /wbb/register.php?sid=108ac5f9efce6e8a7f79979a8fc0950e
Referer: http://www.delftseschaaksite.nl/wbb/register.php?sid=108ac5f9efce6e8a7f79979a8fc0950e