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: 25.04.2024 @ 01:01
Script: /board.php?boardid=27&daysprune=1000&sortfield=lastposttime&sortorder=ASC&sid=90835b727995bac36d84f273fbc6bb41
Referer: http://www.biker-community.com/board.php?boardid=27&daysprune=1000&sortfield=lastposttime&sortorder=ASC&sid=90835b727995bac36d84f273fbc6bb41