Cant Login

==== Required information ====
- iRedMail version:      v0.2 (MySQL)
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):  Mysql
- Linux/BSD distribution name and version: Debian 6 Suqeeze
- Related log if you're reporting an issue:
====

Hi, I installed PostfixAdmin with this Tutorial:
http://www.iredmail.org/wiki/index.php? … QL.Backend

I changed the Mysql Details to vmail/vmailadmin so when i type postmaster@......de  and my password i get the message:
Login is incorrect

I also copied the whole config but it dosent helps.
Could you tell me how can i fix it?