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: 19.04.2024 @ 20:22
Script: /main/usercp.php?action=addsubscription&boardid=18&sid=9f3f5cdd7458d1e9f33a0a715ff0b3b0
Referer: