Unable to login to user manager

Hello,
first of all my goal is to use mikrotik as radius server to provide authentication for several networking equipment (Cisco, Procurve and Mikrotik ofc)

i have a CHR and installed on it two custom package: Dude and user-manager, as you can see in the screenshot.
I created the user to login using the command provided in this guide: http://wiki.mikrotik.com/wiki/User_Manager/Getting_started

But when i connect to my router: http://192.168.180.200/usermanager and try to login using username: admin and password: PASSWORD or using the user credentials i created username: pippo, password: pippo

The result is: invalid username or password

What am i missing?

Note: i’m in the same L2 segment of the network, i can ping the machine and i can load the user manager webpage

Screenshot:
http://imgur.com/a/jugiC

Thank you in advance for your kind reply
Filippo

connect with terminal to your router then type this commands
/tool user-manager customer print
then you can see usermanager user and password

[admin@MikroTik] /tool user-manager customer> print
Flags: X - disabled
database is not acceseble, yet