An error occurred during local report processing.

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C#

Windows

service

Hi
in my project I build a windows service to generate reports on a schedule ,it takes its data source from wcf service but when I want to use windows form report save to pdf method this exception appear An error occurred during local report processing.
while I have created localreport.rdlc and set a dataset to it from wcf service
and every thing is going alright note:I tried in windows form application
what's wrong please help.

this is my code

BasicHttpBinding binding = new BasicHttpBinding();
                EndpointAddress address = new EndpointAddress("http://IPaddress:Port/Services/Myservice.svc");
                ChannelFactory<Services.Myservice> driver = new ChannelFactory<Services.Myservice>(binding, address);
                Services.Myservice channel = driver.CreateChannel();

                Warning[] warnings;
                string[] streamIds;
                string mimeType = string.Empty;
                string encoding = string.Empty;
                string extension = string.Empty;

                ReportDataSource datasource = new ReportDataSource("DataSetName",channel.MyMethod());
                // Setup the report viewer object and get the array of bytes
                ReportViewer viewer = new ReportViewer();
                viewer.ProcessingMode = ProcessingMode.Local;
                viewer.LocalReport.ReportPath = @"Reports\Report1.rdlc";
                viewer.LocalReport.DataSources.Add(datasource); // Add datasource here

                
                //Here is the part the program stop at 
                byte[] bytes = viewer.LocalReport.Render("PDF", null, out mimeType, out encoding, out extension, out streamIds, out warnings);

                string date = DateTime.Now.ToString();
                System.IO.File.Create(@"E:\Report_"+date+".pdf");
                System.IO.File.WriteAllBytes(@"E:\Report_" + date + ".pdf", bytes);