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java.lang.NullPointerException: 	at org.zkoss.zk.ui.AbstractComponent.addMoved(AbstractComponent.java:478)	at org.zkoss.zul.Listitem.addMoved(Listitem.java:332)	at org.zkoss.zk.ui.AbstractComponent.setParent(AbstractComponent.java:1055)	at org.zkoss.zk.ui.AbstractComponent.insertBefore(AbstractComponent.java:1152)	at org.zkoss.zul.Listbox.insertBefore(Listbox.java:1591)	at org.zkoss.zul.impl.ListboxDataLoader.doListDataChange(ListboxDataLoader.java:107)	at org.zkoss.zkmax.zul.impl.LiveListboxDataLoader.doListDataChange(LiveListboxDataLoader.java:95)	at org.zkoss.zul.Listbox.onListDataChange(Listbox.java:2541)	at org.zkoss.zul.Listbox.access$17(Listbox.java:2523)	at org.zkoss.zul.Listbox$4.onChange(Listbox.java:459)	at org.zkoss.zul.AbstractListModel.fireEvent(AbstractListModel.java:60)	at org.zkoss.zul.ListModelList.add(ListModelList.java:162)	at org.zkoss.zktest.bind.issue.B00871BeanInSession2.doButton(B00871BeanInSession2.java:40)