Error in compiling sub report

[sulaiman2043]

i have created a master report and a sub report. I have written the code in jsp to call the master report but it gives an error.Error

Error Loading object from file: "path where the sub report resides".

plz help me out if i am doing something wrong.

 jasperdesign = JasperManager.loadXmlDesign(getServletConfig().getServletContext().getRealPath("/reports/VoucherReport.jrxml"));
  jasperReport = JasperCompileManager.compileReport(jasperdesign);
     
      HashMap map = new HashMap();
      map.put("myParam",voucherId);       
       jasperPrint = JasperFillManager.fillReport(jasperReport, map, con); 
      JasperManager.printReportToPdfFile(jasperPrint,getServletConfig().getServletContext().getRealPath("/reports/myReport.pdf"));

 

it is throwing an exception on jasper print . plz help me out. need a sloution for this