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: /thread.php?goto=lastpost&threadid=21888&sid=245d37b7f4f4701e4273f1d785a8d2ae
Referer: