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: 23.09.2018 @ 19:18
Script: /wbblite/board.php?boardid=21&sid=1efc43be62555eeafcd9a22ff4f5da55
Referer: