Error : Load report failed

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ASP.NET

CrystalReports

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My Code

private void p_PreviewReport()
      {
          m_rptDoc = new ReportDocument();
          dsCAPEX_Report ds = new dsCAPEX_Report();
          string szRptPath = string.Empty;


              switch (ddlReport.SelectedIndex)
              {
                  case 0:
                      m_dt = m_objCAPEXReport.GetCAPEX_DetailProject
                          (txtProjectCode.Text, ddlPeriodYear.SelectedValue, ddlLocationCode.SelectedValue);
                      szRptPath = "/Report/crCAPEX_DetailProject.rpt";
                      m_dt.TableName = "dtCAPEX_DetailProject";
                      break;
                  case 1:
                      m_dt = m_objCAPEXReport.GetCAPEX_SummaryActivity
                          (txtProjectCode.Text, ddlPeriodYear.SelectedValue, ddlLocationCode.SelectedValue);
                      szRptPath = "/Report/crCAPEX_SummaryActivity.rpt";
                      m_dt.TableName = "dtCAPEX_SummaryActivity";
                      break;
                  case 2:
                      m_dt = m_objCAPEXReport.GetCAPEX_SummaryActivityPC
                          (txtProjectCode.Text, ddlPeriodYear.SelectedValue, ddlLocationCode.SelectedValue);
                      szRptPath = "/Report/crCAPEX_SummaryActivityPC.rpt";
                      m_dt.TableName = "dtCAPEX_SummaryActivityPC";
                      break;
              }

              ds.Tables[m_dt.TableName].Merge(m_dt);
              m_rptDoc.Load(Server.MapPath(szRptPath)); //Error

              m_rptDoc.SetDataSource(ds);

              CrystalReportViewer1.ReportSource = m_rptDoc;
              CrystalReportViewer1.DataBind();

              m_rptDoc.SetParameterValue("szPeriodYear", ddlPeriodYear.SelectedValue);
              m_rptDoc.SetParameterValue("szLocation", ddlLocationCode.SelectedItem.Text);

              m_rptDoc.Close();

      }

I get Error

CrystalDecisions.Shared.CrystalReportsException: Load report failed. ---> 
System.Runtime.InteropServices.COMException (0x80004005): Access is denied.
at CrystalDecisions.ReportAppServer.ClientDoc.ReportClientDocumentClass.Open(Object& DocumentPath, Int32 Options)
 at CrystalDecisions.ReportAppServer.ReportClientDocumentWrapper.Open(Object& DocumentPath, Int32 Options) 
at CrystalDecisions.ReportAppServer.ReportClientDocumentWrapper.EnsureDocumentIsOpened() 
--- End of inner exception stack trace ---
 at CrystalDecisions.ReportAppServer.ReportClientDocumentWrapper.EnsureDocumentIsOpened() 
at CrystalDecisions.CrystalReports.Engine.ReportDocument.Load(String filename, OpenReportMethod openMethod, Int16 parentJob) at 
CrystalDecisions.CrystalReports.Engine.ReportDocument.Load(String filename) at CustomWebPart_1.VwpReportCAPEX.VwpReportCAPEXUserControl.p_PreviewReport() 
at CustomWebPart_1.VwpReportCAPEX.VwpReportCAPEXUserControl.btnExport_OnClick(Object sender, EventArgs e) 

Urgent.
Please help me to solve my problem.
I give permission full control to report folder and c:windows/temp
And i check path report, it's right nothing problem with path. But i still get error like that.
Help me.