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: /thread.php?threadid=22148&sid=d75d6799eb5b58942f7c2b2f8ce5ac7b
Referer: