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: 13.05.2024 @ 12:58
Script: /wbb2/board.php?boardid=423&sid=304b6e9e0f8c2a8abe25dd5f9b59906f
Referer: http://www.friendsbistro.de/wbb2/board.php?boardid=423&sid=304b6e9e0f8c2a8abe25dd5f9b59906f