Error inExportToDisk method for Excel (nvalid export DLL or export format)

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Hi,

I'm new to Crystal Reports and facing a problem with its ExportToDisk method. I'm using Crystal Reports 2008 with MS .Net v3.5 SP1. I get the below error while trying to export to a Excel file. The Datasource is a dataset. Could you please help me out?

-Stack Trace

at CrystalDecisions.ReportAppServer.ConvertDotNetToErom.ThrowDotNetException(Exception e)

at CrystalDecisions.ReportSource.EromReportSourceBase.ExportToStream(ExportRequestContext reqContext)

at CrystalDecisions.CrystalReports.Engine.FormatEngine.ExportToStream(ExportRequestContext reqContext)

at CrystalDecisions.CrystalReports.Engine.FormatEngine.Export(ExportRequestContext reqContext)

at CrystalDecisions.CrystalReports.Engine.ReportDocument.ExportToDisk(ExportFormatType formatType, String fileName)

-Error message

Error in File stdiface {3C162A12-5142-4F2C-8709-154FDD0843DB}.rpt:

Invalid export DLL or export format.

-Exception source

CrystalDecisions.ReportAppServer.DataSetConversion

-Error ID

InvalidExportOptions

Any help will be appreciated!

Thank You!