Logon error on report generation

[venerable bede]

I am generating a Crystal report in an asp.net application and keep getting the following error message when I try to export the report to pdf format.

CrystalDecisions.CrystalReports.Engine.LogOnException: Logon failed

I have crawled everywhere on the web and have found a lot written about this problem but all info relates to binding your report to sql server. In my case I am binding to an xml file.

It is driving me insane !!!
If I just display the crystal report in a viewer on a webpage it works fine. Its only when I try to export it that I have the problem. :mad:
Heres my code :

Dim crReportDocument As ReportDocument
Dim crExportOptions As exportoptions
Dim crDiskFileDestinationOptions As diskfiledestinationoptions
Dim Fname As String
crReportDocument = New ReportDocument
crReportDocument.Load("C:\inetpub\wwwroot\TTPresentation\reports\timesheetReport1.rpt")
Fname = "C:\inetpub\wwwroot\TTPresentation\reports\" & "test" & ".pdf"
crDiskFileDestinationOptions = New DiskFileDestinationOptions
crDiskFileDestinationOptions.DiskFileName = Fname
crExportOptions = crReportDocument.ExportOptions
With crExportOptions
.DestinationOptions = crDiskFileDestinationOptions
.ExportDestinationType = ExportDestinationType.DiskFile
.ExportFormatType = ExportFormatType.PortableDocFormat
End With
crReportDocument.Export()
Response.ClearContent()
Response.ClearHeaders()
Response.ContentType = "application/pdf"
Response.WriteFile(Fname)
Response.Flush()
Response.Close()
System.IO.File.Delete(Fname)


I beg of you. Help me or put me out of my misery.