Probem when using .NET Crystal Report generated HTML output

[Archana]

I'm using .net crystal reports export the reports to the
html format. When in debug mode and viewing the html file
through my WEb Application the following exception is
thrown when I try to using navigation controls on the html
file generated by the crystal reports:
"Invalid Export Options"

Also when I run the release version sometimes the file
doesn't get generated at all.

htmlOpts.HTMLBaseFolderName = <ExportPath>;(variable)
htmlOpts.HTMLFileName = <exportFileName;
htmlOpts.HTMLEnableSeparatedPages = true;
htmlOpts.HTMLHasPageNavigator = true;
exportOptions.FormatOptions = htmlOpts;(object of type -
HTMLFormatOPtions)

I would highly appreciate a quick response. Thanx in
advance.

Archana