Not ICA component was found

Can anyone help me please!
I've installed ZEN for Desktops 4 on my NW Servers and Citrix Metaframe
XPe on my Citrix servers. I've followed all the instructions in the
document "Deframe installation and administration" to get deframe to work.
Now, everytime i try to connect to an application object cofigured with
Deframe functionality, i get the message: "No ica component was found".
When i ty to connect to RDP, it works (Application object, Tab Deframe >
Application Setup > Protocol type).
Please help me!!!