Error Code: 1023 - cObject::update() failed: Some fields are empty or

Hello,

i have a problem with the Plesk Modul.

I have install Plesk11 on my server and use the Plesk 10 Modul in WHMCS.

if i press the create button the fields are empty and i became a error:

"Error Code: 1023 - cObject::update() failed: Some fields are empty or contain an improper value. ('login' = '') Errors : login"

But i have fill all fields.

Before i press the create button:
/http://i42.tinypic.com/v6htog.png

after i press the create button:
/http://i39.tinypic.com/dvoexf.png

can anyone help me?

JoKaBo