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 @ 00:57
Script: /wbb/formmail.php?userid=316&sid=9684e3e9d9ab02d8dc6ef18ab8e0ee9f
Referer: http://delftseschaaksite.nl/wbb/formmail.php?userid=316&sid=9684e3e9d9ab02d8dc6ef18ab8e0ee9f