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 @ 13:05
Script: /wbb2/misc.php?action=boardregeln&sid=c8c04446cff25b25df8c9563d2285b70
Referer: