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 @ 06:41
Script: /wbb/register.php?sid=b9f5e73f5c7938fe35ec53f293ae33ab
Referer: http://www.delftseschaaksite.nl/wbb/register.php?sid=b9f5e73f5c7938fe35ec53f293ae33ab