SQL-DATABASE ERROR

Database error in (): Link-ID == false, connect failed
mysql error:
mysql error number:
mysql version: unknown
php version: 7.4.33
Date: 12.05.2024 @ 09:05
Script: /wbb2/index.php/board.php?boardid=170&sid=9151d755398fc0b2fd0580ea702df54f
Referer: http://friendsbistro.de/wbb2/index.php/board.php?boardid=170&sid=9151d755398fc0b2fd0580ea702df54f