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java.lang.IllegalArgumentException: Null 'key' argument.	at org.jfree.data.DefaultKeyedValues.setValue(DefaultKeyedValues.java:229)	at org.jfree.data.DefaultKeyedValues2D.setValue(DefaultKeyedValues2D.java:337)	at org.jfree.data.category.DefaultCategoryDataset.setValue(DefaultCategoryDataset.java:252)	at org.zkoss.zkex.zul.impl.JFreeChartEngine.CategoryModelToCategoryDataset(JFreeChartEngine.java:554)	at org.zkoss.zkex.zul.impl.JFreeChartEngine.access$3300(JFreeChartEngine.java:182)	at org.zkoss.zkex.zul.impl.JFreeChartEngine$Line.createChart(JFreeChartEngine.java:1160)	at org.zkoss.zkex.zul.impl.JFreeChartEngine.drawChart(JFreeChartEngine.java:336)	at org.zkoss.zul.Chart.doSmartDraw(Chart.java:242)	at org.zkoss.zul.Chart.access$100(Chart.java:82)	at org.zkoss.zul.Chart$SmartDrawListener.onEvent(Chart.java:223)	at org.zkoss.zk.ui.AbstractComponent.onEvent(AbstractComponent.java:2732)	at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:2703)	at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:2644)	at org.zkoss.zk.ui.impl.EventProcessor.process(EventProcessor.java:136)	at org.zkoss.zk.ui.impl.UiEngineImpl.processEvent(UiEngineImpl.java:1710)	at org.zkoss.zk.ui.impl.UiEngineImpl.process(UiEngineImpl.java:1495)	at org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage0(UiEngineImpl.java:464)	at org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage(UiEngineImpl.java:316)	at org.zkoss.zk.ui.http.DHtmlLayoutServlet.process(DHtmlLayoutServlet.java:215)	at org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet(DHtmlLayoutServlet.java:135)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)	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$RequestHandler.headerComplete(HttpConnection.java:928)	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)