why my output report is empty?

Hi

I  began  use adobe form . for learning more about this I create a report by using this link

Call Adobe Form through ABAP Program - ABAP Development - SCN Wiki

but my report output is empty with no data. when i put break point in my code, internal table   it_mari have data

but in print preview no record displayed.  I dont know waht is my mistake.

regards

Mahtab.