Passing parameters using Activex to Crystal Reports from Forms 5.0

I'm trying to pass a parameter (called Param in the code below) to a report made in Crystal Reports 8.0 from a form made in Dev 2k Forms 5.0.

I am using the ParameterFields procedure. The following code that performs the call is located in a WHEN-BUTTON-PRESSED trigger:

 crystal_crystalctrl.ReportFileName(:ITEM('TESTACX.AX').interface, 'c:\test.rpt');

crystal_crystalctrl.Destination(:ITEM('TESTACX.AX').interface,crystal_constants.crptToWindow);

 crystal_crystalctrl.ParameterFields(:ITEM('TESTACX.AX').interface,0,' Param;100;True');

 Print_Result :=
crystal_crystalctrl.PrintReport(:ITEM('TESTACX.AX').INTERFACE);

 When running the form, an OLE error occurs at 0x80020005, which is a type mismatch error I believe. This only occured after i put in the parameterfields procedure. Does anyone know what I am doing wrong or how to get around this?

Thanks,
Nathan

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