SQL-DATABASE ERROR

Database error in WoltLab Burning Board (): Link-ID == false, connect failed
mysql error: Can't connect to local server through socket '/var/lib/mysql/mysql.sock' (2)
mysql error number: 2002
mysql version: unknown
php version: 5.6.40
Date: 30.04.2024 @ 18:12
Script: /register.php?sid=288b17ee85df47067e67ea10b194d979
Referer: http://www.biker-community.com/register.php?sid=288b17ee85df47067e67ea10b194d979