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 @ 00:16
Script: /wbb/register.php?sid=cae354e65d2506e249d2d1f41ce1de0f
Referer: http://www.delftseschaaksite.nl/wbb/register.php?sid=cae354e65d2506e249d2d1f41ce1de0f