C# console app export crystal report error

The following code running fine on my PC, but when I publish the app to the server and install it. It gives me error. This is a console app, targeting .net framework 4,

string pdf =Environment.GetFolderPath(
   System.Environment.SpecialFolder.DesktopDirectory)+"\\zzz.pdf";

   string rpt =Environment.GetFolderPath(
   System.Environment.SpecialFolder.DesktopDirectory)+"\\zzz.rpt";
   ReportDocument cryRpt;
  cryRpt =newReportDocument();
  cryRpt.Load(rpt);
  cryRpt.SetDatabaseLogon("******","*******");

   //cryRpt.ExportToDisk(CrystalDecisions.Shared.ExportFormatType.PortableDocFormat, pdf");

   MemoryStream memoryStream =newMemoryStream();
   Stream exportStream = cryRpt.ExportToStream(ExportFormatType.PortableDocFormat);
  exportStream.CopyTo(memoryStream);

   byte[] content = memoryStream.ToArray();

   // Write out PDF from memory stream.
   Console.WriteLine(pdf);
  using (FileStream fs =File.Create(pdf))
   {
  fs.Write(content,0,(int)content.Length);
   }

  This is the error When I using "ExportToStream" it gives me error as the following. When I export it to disk it gives me the similar error instead of using ExportToSteam. What I don;t get is When I am exporting it as stream, I am pointing to any location , why does it throw me "The system can not find the path specified"