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: /wbb2/calendar.php?sid=e6e7fe9023d19ba4a603e0e8095108d4
Referer: