CrystalDecisions.CrystalReports.Engine.InternalException: Print Engine not opened

I developed a system which Exports Crystal Reports properly on the development machine. On clicking the Export button on the Testing Server I get the above error.

Both the Development machine and the Testing Server are connected to a Network Printer.

How can I solve the problem?

Nduguyettu

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
 
        Dim Rpt As rptGenTransactions = New rptGenTransactions
 
        Dim DiskOpts As CrystalDecisions.Shared.DiskFileDestinationOptions = New CrystalDecisions.Shared.DiskFileDestinationOptions
        Rpt.ExportOptions.ExportDestinationType = CrystalDecisions.[Shared].ExportDestinationType.DiskFile
 
        Rpt.ExportOptions.ExportFormatType = CrystalDecisions.[Shared].ExportFormatType.PortableDocFormat
 
        DiskOpts.DiskFileName = "c:\Reports\Output.pdf"
 
        Rpt.SetDataSource(DS)
        Rpt.ExportOptions.DestinationOptions = DiskOpts
 
 
        Rpt.Export()
 
    End Sub

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