SQL-DATABASE ERROR

Database error in WoltLab Burning Board (): Link-ID == false, connect failed
mysql error: Access denied for user 'web6'@'localhost' (using password: YES)
mysql error number: 1045
mysql version: unknown
php version: 5.6.40-68+0~20230902.80+debian11~1.gbpa2012b
Date: 17.04.2024 @ 00:22
Script: /main/usercp.php?action=addsubscription&boardid=83&sid=642d699a5d1d59df9c3c2cc4e90efc0a
Referer: