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java.lang.IndexOutOfBoundsException: Index: 0	at java.util.Collections$EmptyList.get(Collections.java:3212)	at org.icefaces.ace.model.tree.LazyNodeDataModel.navToChild(LazyNodeDataModel.java:100)	at org.icefaces.ace.model.tree.LazyNodeDataModel.navToKey(LazyNodeDataModel.java:72)	at org.icefaces.ace.component.tree.Tree.setNodeToKey(Tree.java:157)	at org.icefaces.ace.component.tree.Tree.setKey(Tree.java:125)	at org.icefaces.ace.component.tree.TreeDecoder.decodeReordering(TreeDecoder.java:84)	at org.icefaces.ace.component.tree.TreeDecoder.decode(TreeDecoder.java:66)	at org.icefaces.ace.component.tree.TreeRenderer$1.(TreeRenderer.java:64)	at org.icefaces.ace.component.tree.TreeRenderer.decode(TreeRenderer.java:63)	at javax.faces.component.UIComponentBase.decode(UIComponentBase.java:832)	at org.icefaces.ace.component.tree.Tree.processDecodes(Tree.java:299)	at com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback.visit(PartialViewContextImpl.java:573)	at com.sun.faces.component.visit.PartialVisitContext.invokeVisitCallback(PartialVisitContext.java:183)	at org.icefaces.ace.component.tree.Tree.visitTree(Tree.java:392)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)	at javax.faces.component.UIForm.visitTree(UIForm.java:371)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)	at com.sun.faces.context.PartialViewContextImpl.processComponents(PartialViewContextImpl.java:403)	at com.sun.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:266)	at javax.faces.context.PartialViewContextWrapper.processPartial(PartialViewContextWrapper.java:219)	at org.icefaces.impl.context.DOMPartialViewContext.processPartial(DOMPartialViewContext.java:322)	at javax.faces.context.PartialViewContextWrapper.processPartial(PartialViewContextWrapper.java:219)	at javax.faces.component.UIViewRoot.processDecodes(UIViewRoot.java:927)