Cannot read the next data row for the data set Dataset1

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SQL-Server-2005

SQL-Server

C#3.5

I want to generate report in win form by reportviewer user control.
my code is

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 in sql function

select A. ContractorName as ContractorName,A.st as st,A.Rank as Rank ,sum(A.TWDH) as TWDH ,
	sum(A.TOTH) as TOTH,
	sum(A.TOTM) as TOTM,
	sum(A.TOTHS) as TOTHS,
	sum(A.TOTMS) as TOTMS
	FROM 

	(
		
		select T.ContractorName as ContractorName,T.SkillType as st,T.RankName as Rank,
		T.Date as Date ,

		TWDH=(case when datename(dw,convert(datetime,convert(varchar(10),T.Date,103),103))='Sunday'
		then  0 else count(T.workDuration) end),

		TOTH=(case when datename(dw,convert(datetime,convert(varchar(10),T.Date,103),103))='Sunday'
		then  0 else sum(DatePart(HH,T.ot)) end),

		TOTM=(case when datename(dw,convert(datetime,convert(varchar(10),T.Date,103),103))='Sunday'
		then  0 else sum(DatePart(mi,T.ot)) end),

		TOTHS =(case when datename(dw,convert(datetime,convert(varchar(10),T.Date,103),103))='Sunday'
		then  (sum(DatePart(HH,T.ot))+(count(T.workDuration)*8))  else 0 end),

		TOTMS=(case when datename(dw,convert(datetime,convert(varchar(10),T.Date,103),103))='Sunday'
		then  sum(DatePart(mi,T.ot)) else 0 end)
		FROM
        (
			SELECT * FROM BillingReport(@startDate,@endDate,@siteName)
		) T
		group by ContractorName,skillType,RankName,Date
		)A
		group by ContractorName,st,Rank

The report returns results in management studio and from the reports services (visual studio 2005), BUT:
After I deploy the project, from the browser I don't get ANY results, but this error message:


when i pass short range of date it works fine but more range like 1 month
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.