ssrs report web service to save report as pdf throws error Soap exception unhandeled by user code

s.Diagnostics.Utilities.ItemNotFoundException: The item '/DataMgmt/Sample Letter' cannot be found.


Please check my code and let me know what I can do to run this successfully. Once this is done, I would like to get help with passing a parameter (memberID) to the generate report for that member, through this application.

Thank You in advance for your help.

 public static void SaveReport()
        {

            RS2005.ReportingService2005 rs;
            RE2005.ReportExecutionService rsExec;

            // Create a new proxy to the web service
            rs = new RS2005.ReportingService2005();
            rsExec = new RE2005.ReportExecutionService();

            // Authenticate to the Web service using Windows credentials
            rs.Credentials = System.Net.CredentialCache.DefaultCredentials;
            rsExec.Credentials = System.Net.CredentialCache.DefaultCredentials;

            rs.Url = "http://myServer/ReportServer_DEVPROJECT/ReportService2005.asmx";
            rsExec.Url = "http://myServer/ReportServer_DEVPROJECT/ReportExecution2005.asmx";

            string historyID = null;
            string deviceInfo = null;
            string format = "pdf";
            Byte[] results;
            string encoding = String.Empty;
            string mimeType = String.Empty;
            string extension = String.Empty;
            RE2005.Warning[] warnings = null;
            string[] streamIDs = null;

          
            string fileName = @"c:\temp\samplerHAPeport.pdf";
            string _reportName = @"/DataMgmt/Sample HAP Letter";
            string _historyID = null;
            bool _forRendering = false;
            RS2005.ParameterValue[] _values = null;
            RS2005.DataSourceCredentials[] _credentials = null;
            RS2005.ReportParameter[] _parameters = null;

            try
            {
                _parameters = rs.GetReportParameters(_reportName, _historyID, _forRendering, _values, _credentials);
                RE2005.ExecutionInfo ei = rsExec.LoadReport(_reportName, historyID);
                RE2005.ParameterValue[] parameters = new RE2005.ParameterValue[1];

                if (_parameters.Length > 0)
                {
                    //parameters[0] = new RE2005.ParameterValue();
                    //parameters[0].Label = "";
                    //parameters[0].Name  = "";
                    //parameters[0].Value = "";
                }
                rsExec.SetExecutionParameters(parameters, "en-us");

                results = rsExec.Render(format, deviceInfo,
                          out extension, out encoding,
                          out mimeType, out warnings, out streamIDs);

                using (FileStream stream = File.OpenWrite(fileName))
                {
                    stream.Write(results, 0, results.Length);
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }

        }


       protected void BtnGenReport_Click(object sender, EventArgs e)
        {
            SaveReport();
        }