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: 22.05.2024 @ 07:04
Script: /wbb2/board.php?boardid=188&sid=74e00fe4f0b3cf9a64e15062cbb1c25c
Referer: http://friendsbistro.de/wbb2/board.php?boardid=188&sid=74e00fe4f0b3cf9a64e15062cbb1c25c