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 @ 08:01
Script: /wbb/usercp.php?action=addsubscription&threadid=202&sid=fb0ae3f08f37d43b546a9b3f5e314ec2
Referer: http://delftseschaaksite.nl/wbb/usercp.php?action=addsubscription&threadid=202&sid=fb0ae3f08f37d43b546a9b3f5e314ec2