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: /board.php?boardid=47&daysprune=1000&sortfield=lastposttime&sortorder=DESC&sid=38be8fb7d7dfdc35adbbac58e338d263&page=10
Referer: http://www.biker-community.com/board.php?boardid=47&daysprune=1000&sortfield=lastposttime&sortorder=DESC&sid=38be8fb7d7dfdc35adbbac58e338d263&page=10