SQL-DATABASE ERROR

Database error in WoltLab Burning Board (): Link-ID == false, connect failed
mysql error: Can't connect to local MySQL server through socket '/tmp/mysql5.sock' (111)
mysql error number: 2002
mysql version: unknown
php version: 5.2.17
Date: 03.05.2024 @ 10:59
Script: /board/board.php?boardid=10&sid=a2ecce5849b25c72d8bbc4aaf9fd592f
Referer: