Smartform in web dynpro Abap

Hi,

I'm trying to implement a web dynpro abap with a smartform.

I used the "How to Display a Smartform as PDF document in Web Dynpro for ABAP" document that e can find on sdn.

My problem is that when the form is called, there is a dump

"Please maintain an output device in your user master data. ".

I copied the code in a report and the form is displayed.

Did I miss something?

Kr

Karim