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' (2)
mysql error number: 2002
mysql version: unknown
php version: 5.2.17
Date: 02.05.2024 @ 19:58
Script: /board.php?boardid=13&sid=21ec29ba2af90fbf63d1f4d830430774
Referer: