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: 29.03.2024 @ 08:53
Script: /main/usercp.php?action=addsubscription&threadid=1223&sid=2349361fd1c4b2cb75b9ed2efbe11f3e
Referer: