Report in winform

Question

I want to generate report in winform.

 

I have reportviewer.

I call the report by this function

public void getReportFrmServer(string report, string[] param)
{
try
{
this.reportViewer1.ServerReport.ReportPath = "/Report From_Iris_New/" + report;
this.reportViewer1.ServerReport.Timeout = 3600000;
ReportParameter[] parameter = new ReportParameter[5];
parameter[0] = new ReportParameter("startDate", param[0]);
parameter[1] = new ReportParameter("endDate", param[1]);
parameter[2] = new ReportParameter("contractorName", param[2]);
parameter[3] = new ReportParameter("siteName", param[3]);
parameter[4] = new ReportParameter("FuncName", param[4]);
this.reportViewer1.ServerReport.SetParameters(parameter);
this.reportViewer1.RefreshReport();
}
catch (Exception exception)
{
MessageBox.Show(exception.Message);
}
} 

 

in sql 

 SELECT * FROM BillingReport(@startDate,@endDate,@siteName)

 

 

 It runs fine when I passed short date range like 25/07/2014 to 30/07/2014.

But when I passed date range  like 25/07/2014 to 26/08/2014.

It gives en error 

An error occured during report processing.
Cannot read the next data row for the data set Dataset1.
A severe error occured on the current command. The results, if any, should be discarded.

 

while I run query from Microsoft sql server Management studio report is generated

please suggest me!