SQL-DATABASE ERROR

Database error in WoltLab Burning Board (): Link-ID == false, connect failed
mysql error:
mysql error number:
mysql version: unknown
php version: 7.2.34-nmm9
Date: 22.05.2024 @ 13:01
Script: /wbb2/formmail.php?userid=103&sid=cc3999da7d047e5fd8a23e8b18c1d32e
Referer: