Display Image on Report.rdlc error when running in IIS

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C#

I have a problem display image on RDLC using parameter (source:external). when i run on visual studio 2010, it's OK, running well. But when I publish in IIS 7, and run the report i have an error (An error occurred during local report processing). This my code:

LocalReport report = new LocalReport();
report.ReportPath = ConfigurationManager.AppSettings["RDLCPath"] + "PDF_Template.rdlc";
var imagePath = @"file:\" + ConfigurationManager.AppSettings["ImagePath"];
var param = new List<ReportParameter>();
ReportParameter paramLogos1 = new ReportParameter("Path1", imagePath + approval[0].TaskOwnerID1 + ".jpg");
ReportParameter paramLogos2 = new ReportParameter("Path2", imagePath + approval[0].TaskOwnerID2 + ".jpg");
ReportParameter paramLogos3 = new ReportParameter("Path3", imagePath + approval[0].TaskOwnerID3 + ".jpg");
ReportParameter paramLogos4 = new ReportParameter("Path4", imagePath + approval[0].TaskOwnerID4 + ".jpg");
ReportParameter paramLogos5 = new ReportParameter("Path5", imagePath + approval[0].TaskOwnerID5 + ".jpg");
    
report.EnableExternalImages = true;
param.Add(paramLogos1);
param.Add(paramLogos2);
param.Add(paramLogos3);
param.Add(paramLogos4);
param.Add(paramLogos5);

report.SetParameters(param); //error when execute this code 

I'm using absolute path (imagePath + approval[0].TaskOwnerID1 + ".jpg is absolute path)