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: 28.05.2024 @ 06:43
Script: /wbb2/board.php?boardid=111%3Fsid%3Da8adf9fe25411478dcfaafaa49443b1c
Referer: http://www.friendsbistro.de/wbb2/board.php?boardid=111%3Fsid%3Da8adf9fe25411478dcfaafaa49443b1c