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java.lang.NullPointerException: 	at com.icesoft.faces.component.tree.Tree.visitRows(Tree.java:1446)	at com.icesoft.faces.component.tree.Tree.visitTree(Tree.java:1401)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1600)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1600)	at javax.faces.component.UIForm.visitTree(UIForm.java:344)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1600)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1600)	at com.sun.faces.application.view.StateManagementStrategyImpl.saveView(StateManagementStrategyImpl.java:160)	at com.sun.faces.application.StateManagerImpl.saveView(StateManagerImpl.java:133)	at com.sun.faces.application.view.WriteBehindStateWriter.flushToWriter(WriteBehindStateWriter.java:225)	at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:418)	at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:410)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)	at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:859)	at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)	at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1555)	at java.lang.Thread.run(Thread.java:619)