SQL-DATABASE ERROR

Database error in WoltLab Burning Board: Link-ID == false, connect failed
mysql error: Access denied for user 'HTO01FLBUQTS'@'c4aweb29.aul.t-online.de' (using password: YES)
mysql error number: 1045
Date: 19.06.2018 @ 12:30
Script: /wbblite/usercp.php?action=buddy&add=38
Referer: