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: 17.05.2024 @ 15:24
Script: /wbb2/misc.php?action=boardregeln&sid=d6710e7aa60950a8955f51da7cbdacc9
Referer: