MySQL_class: Database Error occured!

 CODE: 1044
 DESC: Access denied for user 'handybuz_userdb'@'localhost' to database 'handybuz_marketdb'
 FILE: index.php
 QCNT: 0
 INFO: Connect(): SelectDB('handybuz_marketdb') failed!

Please inform contact@handybuzz.com about this problem.
PHP v5.6.31 / MySQL Class v0.36