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I was generating rdlc reports like below code:

var proposalFor = ecmClient.ServiceProxy.GetProposalFor(projectId);

           LocalReport localReport = new LocalReport();
           localReport.ReportPath = Server.MapPath("~/Reports/TCOSummary.rdlc");

           localReport.DataSources.Add(new ReportDataSource("ProposalFor_DS", proposalFor));

           string reportType = "Pdf";
           string mimeType;
           string encoding;
           string fileNameExtension;

           string deviceInfo = "<DeviceInfo>" +
               "  <OutputFormat>Excel</OutputFormat>" +
               "  <PageWidth>8.5in</PageWidth>" +
               "  <PageHeight>11in</PageHeight>" +
               "  <MarginTop>0.5in</MarginTop>" +
               "  <MarginLeft>1in</MarginLeft>" +
               "  <MarginRight>1in</MarginRight>" +
               "  <MarginBottom>0.5in</MarginBottom>" +
           Warning[] warnings;
           string[] streams;
           byte[] renderedBytes;

           renderedBytes = localReport.Render(reportType, deviceInfo, out mimeType, out encoding, out fileNameExtension, out streams, out warnings);

           return File(renderedBytes, mimeType);

Main rdlc was coming properly and subreport not showing
shows below error:
Data retrieval failed for the subreport,
'Subreport1', located at: D:
\SampleReport.rdlc. Please check the log files
for more information.

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