i am geetting the error parameter field is in correct

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C#

CrystalReports

RptSuperannuationReport RptSuperannuationReport = new RptSuperannuationReport();
RptSuperannuationReport.SetDataSource(PVDT);
//ReportDocument myDataReport = new CrystalDecisions.CrystalReports.Engine.ReportDocument();
//myDataReport.Load(@"C:\Layouts\Report.rpt");



ReportDocument reportDocument = new ReportDocument();
ParameterField paramField = new ParameterField();
ParameterFields paramFields = new ParameterFields();
ParameterDiscreteValue paramDiscreteValue = new ParameterDiscreteValue();
Crv_RptView.Refresh();
//Set instances for input parameter 1 - FromDate
paramField.Name = "FromDate";
//Below variable can be set to any data
//present in SalseData table, Department column
paramDiscreteValue.Value = FromDate;
paramField.CurrentValues.Add(paramDiscreteValue);

paramFields.Add(paramField);

paramField = new ParameterField();
paramField.Name = "ToDate";
paramDiscreteValue = new ParameterDiscreteValue();
paramDiscreteValue.Value = ToDate;
paramField.CurrentValues.Add(paramDiscreteValue);

//Add the paramField to paramFields
paramFields.Add(paramField);

Crv_RptView.ParameterFieldInfo = paramFields;



Crv_RptView.ReportSource = RptSuperannuationReport;