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java.lang.ArrayIndexOutOfBoundsException: -1	at java.util.concurrent.CopyOnWriteArrayList.get(CopyOnWriteArrayList.java:368)	at java.util.concurrent.CopyOnWriteArrayList.get(CopyOnWriteArrayList.java:377)	at undefined.PlanNodeImpl.getChildAt(PlanNodeImpl.java:74)	at org.icefaces.ace.model.tree.ListNodeDataModel.navToChild(ListNodeDataModel.java:127)	at org.icefaces.ace.model.tree.ListNodeDataModel.navToChild(ListNodeDataModel.java:24)	at org.icefaces.ace.component.tree.Tree.setNodeToChild(Tree.java:178)	at org.icefaces.ace.component.tree.Tree.iterateTreeLevel(Tree.java:880)	at org.icefaces.ace.component.tree.Tree.iterateTreeLevel(Tree.java:881)	at org.icefaces.ace.component.tree.Tree.iterateTreeLevel(Tree.java:881)	at org.icefaces.ace.component.tree.Tree.iterateTreeLevel(Tree.java:881)	at org.icefaces.ace.component.tree.Tree.iterate(Tree.java:822)	at org.icefaces.ace.component.tree.Tree.processValidators(Tree.java:348)