SQL-DATABASE ERROR

Database error in WoltLab Burning Board (): Link-ID == false, connect failed
mysql error: Access denied for user 'styleschule'@'localhost' (using password: YES)
mysql error number: 1045
mysql version: unknown
php version: 5.6.40
Date: 04.03.2024 @ 21:17
Script: /calendar.php?sid=747ad7ed0d11558adcb318979bfb145b
Referer: