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: /wbb2/login.php?sid=d682df51db0d63dc52c1e8b74dc9e8ee
Referer: