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java.lang.RuntimeException: The document is not open.	at com.lowagie.text.pdf.PdfWriter.getDirectContent(Unknown Source)	at org.zkoss.zss.model.impl.pdf.PdfExporter.printPage(PdfExporter.java:1139)	at org.zkoss.zss.model.impl.pdf.PdfExporter.printSheet(PdfExporter.java:1068)	at org.zkoss.zss.model.impl.pdf.PdfExporter.exportSheetSelection(PdfExporter.java:690)	at org.zkoss.zss.model.impl.pdf.PdfExporter.exportSheet(PdfExporter.java:785)	at org.zkoss.zss.model.impl.pdf.PdfExporter.export(PdfExporter.java:258)	at org.zkoss.zss.api.impl.ExporterImpl.export(ExporterImpl.java:49)	at org.zkoss.zss.app.repository.impl.BookUtil.saveBookToWorkingFolder(BookUtil.java:133)	at org.zkoss.zss.app.ui.AppCtrl.doExportPdf(AppCtrl.java:349)	at org.zkoss.zss.app.ui.AppCtrl.onAppEvent(AppCtrl.java:375)	at org.zkoss.zss.app.ui.CtrlBase$1.onEvent(CtrlBase.java:64)	at org.zkoss.zk.ui.AbstractComponent.onEvent(AbstractComponent.java:2752)	at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:2723)	at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:2664)	at org.zkoss.zk.ui.impl.EventProcessor.process(EventProcessor.java:136)	at org.zkoss.zk.ui.impl.UiEngineImpl.processEvent(UiEngineImpl.java:1765)	at org.zkoss.zk.ui.impl.UiEngineImpl.process(UiEngineImpl.java:1550)	at org.zkoss.zk.ui.impl.UiEngineImpl.execUpdate(UiEngineImpl.java:1260)	at org.zkoss.zk.au.http.DHtmlUpdateServlet.process(DHtmlUpdateServlet.java:603)	at org.zkoss.zk.au.http.DHtmlUpdateServlet.doGet(DHtmlUpdateServlet.java:485)	at org.zkoss.zk.au.http.DHtmlUpdateServlet.doPost(DHtmlUpdateServlet.java:494)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)