I have created a crystal report in vs2010 with .net4.0. when I publish the website it throws the error

A document processed by the JRC engine cannot be opened in C++ stack

I published the website in server and I'm trying to access it from client, I did keet the .rpt file in app_code, but again getting the same error. So I created a folder wwwroot and in that folder I kept the asp_client and website folder and I gave the physical path to wwwroot. everything working fine except crystal report. In .cs file code is as follows:

    ReportDocument rptDoc = new ReportDocument();
    DataSetForCrystalReport ds = new DataSetForCrystalReport();
    DataSetForCrystalReport dsHeader = new DataSetForCrystalReport();
    DataTable dt = new DataTable();
    DataTable dtHeader = new DataTable();
    dt.TableName = "dtBill";
    string ReceiptNo = Request.QueryString["ReceiptNo"];
    dt = getAllOrders(ReceiptNo).Tables[0];
    dtHeader = TblcompanysettingsService.GetOrganizationDetails();
    ds.Tables[1].Merge(dt);
    ds.Tables[2].Merge(dtHeader);
    rptDoc.Load(Server.MapPath("crBill.rpt"));
    rptDoc.SetDataSource(ds);
    CrystalReportViewer1.ReportSource = rptDoc;

stack trace of error:

[COMException (0x80041811): Unsupported Operation. A document processed by the JRC engine cannot be opened in the C++ stack.]
   CrystalDecisions.ReportAppServer.ClientDoc.ReportClientDocumentClass.Open(Object& DocumentPath, Int32 Options) +0
   CrystalDecisions.ReportAppServer.ReportClientDocumentWrapper.Open(Object& DocumentPath, Int32 Options) +147
   CrystalDecisions.ReportAppServer.ReportClientDocumentWrapper.EnsureDocumentIsOpened() +422

[CrystalReportsException: Load report failed.]
   CrystalDecisions.ReportAppServer.ReportClientDocumentWrapper.EnsureDocumentIsOpened() +549
   CrystalDecisions.CrystalReports.Engine.Rep
c# asp.net crystal-reports localhost
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