My Report Fails once it is exported

I am using crystal reports that come with visual studio 2008 and i also tested with visual studio 2005.

I have a report and i can view any number of reports but when i export the report as pdf or any other format.The next report fails. Is there a solution to address this problem . I am just using the crystal reports viewer to show the report.

This is a windows application hence i am using the reportviewer that comes with the visual studio to show the report and using the menubar button to export the report.

The error i get is simple "LOAD REPORT FAILED"

Any Help???????????