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 @ 10:28
Script: /wbb2/misc.php?action=boardregeln&sid=1c584fcdb6a5251df00be0e00d3ec2ef
Referer: