SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Link-ID == false, connect failed
mysql error: No such file or directory
mysql error number: 2002
mysql version: unknown
php version: 5.6.40-nmm8
Date: 16.05.2024 @ 05:30
Script: /xforum/editpost.php?postid=32378&sid=48d5cfa4189b43cf299c0f3bae8c0943
Referer: