SQL-DATABASE ERROR

Database error in WoltLab Burning Board (): Link-ID == false, connect failed
mysql error:
mysql error number:
mysql version: unknown
php version: 7.2.34-36+ubuntu18.04.1+deb.sury.org+1
Date: 28.11.2023 @ 19:38
Script: /forum/board.php?boardid=3&sid=4d859010c7a65d13fa9a4551e7ba6019
Referer: