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' (111)
mysql error number: 2002
Date: 21.05.2024 @ 00:15
Script: /wbb/usercp.php?action=buddy&add=289&sid=324ebaa10a50f5e14ddff73a8486c48a
Referer: http://delftseschaaksite.nl/wbb/usercp.php?action=buddy&add=289&sid=324ebaa10a50f5e14ddff73a8486c48a