cluebringer login issue

==== Required information ====
- iRedMail version: 0.8.3
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP
- Linux/BSD distribution name and version: Ubuntu 12.04.2 LTS
- Related log if you're reporting an issue:

https log file:

[Thu Feb 21 10:13:01 2013] [error] [client xxx.xxx.xxx.xxx] user postmaster@xxxxx.xx not found: /cluebringer/

====

Hi there!

Unfortunately I'm not able to login to cluebringer, even with the global domain admin.
Any hints?

Ist it OK to install iRedAPD, too, even if there is already cluebringer installed?

Thanks in advance!

Best,
Achim!