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 @ 01:26
Script: /wbb/register.php?sid=a0d1df8b3c523ceb86030a7ac9347e89
Referer: http://delftseschaaksite.nl/wbb/register.php?sid=a0d1df8b3c523ceb86030a7ac9347e89