Common Language RunTime Debugging Service

Hi,
     We have built application in C#. This exe works fine with small Reports. But failed and give following error message whenever we try to run a big reports/processes:

              ReportGenerator.exe Common Language Runtime Debugging Services
              Application has generated an exception that could not be handled.
              Process ID=0x14 (1300), Thread Id=0xe8(232)

               Click OK to terminate the application.
               Click CANCEL to debug the application.

Any help will be grate appriciated...
Regards
H.M.Sohaib