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 '/srv/.mysql/mysql.sock' (111)
mysql error number: 2002
mysql version: unknown
php version: 5.6.19
Date: 18.05.2024 @ 01:58
Script: /calendar.php?action=addevent&type=private&sid=1b1a42ae2ad2f323e6dcb25c9cce42ba
Referer: