output could not be displayed in smartforms

Hi All,

I am working on the picking list smart form.when i am issuing the output in vl03n transaction I am able to see the print priew ,but when I am coming back of print priew getting the message like OUTPUT COULD NOT BE DISPLAYED .Can anybody tell me where I am doing the mistake.

It ia an urgent task.Points will be rewarded for usefeul answers.

Thanks,

Arun