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 @ 10:47
Script: /wbb2/register.php?sid=10f4c66ff7d7b2fb48d4182cc6bcf763
Referer: http://www.friendsbistro.de/wbb2/register.php?sid=10f4c66ff7d7b2fb48d4182cc6bcf763