Hallo, I'm trying to run my Java code with a virtualizer in it I'm having the following error which is attached to a file below. My java code is written below. My question is why this error occurs.I've tried all my best to solve it but didn't succeed. Thanks in advance regards Fatsy public class UseCase { /** * @param args unused */ public static void main(String[] args) { JasperReport jasperReport; JasperPrint jasperPrint; Map parameter = new HashMap(); try { JRFileVirtualizer virtualizer = new JRFileVirtualizer(2,"tmp"); parameter.put(JRParameter.REPORT_VIRTUALIZER, virtualizer); JRXmlDataSource xml = new JRXmlDataSource(new File("edb-usecases.xml"), "/UseCaseGroup/UseCaseGroup/UseCase"); jasperReport = JasperCompileManager.compileReport("UseCase.jrxml"); jasperPrint = JasperFillManager.fillReport(jasperReport,parameter, xml); JasperExportManager.exportReportToPdfFile(jasperPrint,"usecase.pdf"); virtualizer.cleanup(); } catch (JRException e) { e.printStackTrace(); } } } [file name=error-40e640650ed0001818de5f5f9ccc12aa.txt size=4281]http://www.jasperforge.org/components/com_joomlaboard/uploaded/files/error-40e640650ed0001818de5f5f9ccc12aa.txt[/file]