Display Table - URGENT

[Abhimanyu Koul]

Hi everybody!
 
I am using export="true" in display table. All the exports are working
fine but I am having a problem in pdf export. The pdf viewer throws an
error message whenever we try to open the pdf file saying that the file
does not exist. But whenever, I save the file first and then open it -
it opens properly.
Where can be the problem.
 
Kindly help