Load report Error while export crystal report

Question

Platform VS 2008 .NET framework 3.5 and crystalreports 2008 basic build into VS 2008, C# winForm.
I am using crystalreportviewer to display report.
When I export report using Export Report tool of crystal viewer, it works fine but when I try to load report again it gives 'Load Report Error' at reportDocument.Load() method.


Regards