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java.lang.NullPointerException: 	at org.zkoss.zss.model.impl.pdf.PdfExporter.setAutoRowBreaks(PdfExporter.java:341)	at org.zkoss.zss.model.impl.pdf.PdfExporter.setRowColumnBreaks(PdfExporter.java:304)	at org.zkoss.zss.model.impl.pdf.PdfExporter.exportSheet(PdfExporter.java:266)	at org.zkoss.zss.model.impl.pdf.PdfExporter.export(PdfExporter.java:162)	at org.zkoss.zss.api.impl.ExporterImpl.export(ExporterImpl.java:48)	at org.zkoss.zss.app.repository.impl.BookUtil.saveBookToWorkingFolder(BookUtil.java:133)	at org.zkoss.zss.app.ui.AppCtrl.doExportPdf(AppCtrl.java:367)	at org.zkoss.zss.app.ui.AppCtrl$3.process(AppCtrl.java:121)	at org.zkoss.zss.ui.impl.DefaultUserActionManagerCtrl.dispatchAuxAction(DefaultUserActionManagerCtrl.java:272)	at org.zkoss.zss.ui.impl.DefaultUserActionManagerCtrl.onEvent(DefaultUserActionManagerCtrl.java:395)	at org.zkoss.zssex.ui.impl.UserActionManagerCtrlImpl.onEvent(UserActionManagerCtrlImpl.java:285)	at org.zkoss.zss.ui.Spreadsheet$3.onEvent(Spreadsheet.java:386)	at org.zkoss.zk.ui.AbstractComponent.onEvent(AbstractComponent.java:2748)	at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:2719)	at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:2660)	at org.zkoss.zk.ui.impl.EventProcessor.process(EventProcessor.java:136)	at org.zkoss.zk.ui.impl.UiEngineImpl.processEvent(UiEngineImpl.java:1720)	at org.zkoss.zk.ui.impl.UiEngineImpl.process(UiEngineImpl.java:1505)	at org.zkoss.zk.ui.impl.UiEngineImpl.execUpdate(UiEngineImpl.java:1215)	at org.zkoss.zk.au.http.DHtmlUpdateServlet.process(DHtmlUpdateServlet.java:600)	at org.zkoss.zk.au.http.DHtmlUpdateServlet.doGet(DHtmlUpdateServlet.java:482)	at org.zkoss.zk.au.http.DHtmlUpdateServlet.doPost(DHtmlUpdateServlet.java:491)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:401)	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)	at org.mortbay.jetty.Server.handle(Server.java:326)	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)	at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:945)	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)