Error: Subreport could not be shown?

//Create datatable objects
//...just the last three lines of this section...
dsReport.dtAppComponentDataTable dtAppComponent = new dsReport.dtAppComponentDataTable();
        dsReport.dtAppBusinessFunctionsDataTable dtAppBusinessFunction = new dsReport.dtAppBusinessFunctionsDataTable();
        dsReport.dtAppProductCategoryDataTable dtAppProductCategory = new dsReport.dtAppProductCategoryDataTable();
 
//Create ReportDataSource objects filled with the previously 
//           instantiated datatable objects
//...just the last three lines of this section...
ReportDataSource reportAppComponentDataSource = new ReportDataSource("dsReport_dtAppComponent", dtAppComponent);
        ReportDataSource reportAppBusinessFunctionDataSource = new ReportDataSource("dsReport_dtAppBusinessFunction", dtAppBusinessFunction);
        ReportDataSource reportAppProductCategoryDataSource = new ReportDataSource("dsReport_dtAppProductCategory", dtAppProductCategory);
 
 
//Add the ReportDataSources to the Reports DataSources collection
//...just the last three lines of this section...
localReport.DataSources.Add(reportAppComponentDataSource);
        localReport.DataSources.Add(reportAppBusinessFunctionDataSource);
        localReport.DataSources.Add(reportAppProductCategoryDataSource);
 
 
//Setup report parameters
ReportParameter paramAppID = new ReportParameter("AppID", dtApplication[0][dtApplication.AppIDColumn].ToString());
        localReport.SetParameters(new ReportParameter[] { paramAppID });
        ReportParameter paramAppName = new ReportParameter("AppName", dtApplication[0][dtApplication.AppNameColumn].ToString());
        localReport.SetParameters(new ReportParameter[] { paramAppName });
        ReportParameter paramAppIdentifier = new ReportParameter("AppIdentifier", dtApplication[0][dtApplication.AppIdentifierColumn].ToString());
        localReport.SetParameters(new ReportParameter[] { paramAppIdentifier });
 
//Setup various local settings and params for the render call
...
 
renderedBytes = localReport.Render(
            reportType,
            deviceInfo,
            out mimeType,
            out encoding,
            out fileNameExtension,
            out streams,
            out warnings);
 
        Response.Clear();
        Response.ContentType = mimeType;
        Response.AddHeader("content-disposition", "attachment; filename=ApplicationDetail." + fileNameExtension);
        Response.BinaryWrite(renderedBytes);
        Response.End();

                                  

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