org.zkoss.zk.ui.UiException: class org.zkoss.zul.SimpleTreeModel must implement interface org.zkoss.zul.ext.TreeSelectionModel

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org.zkoss.zk.ui.UiException: class org.zkoss.zul.SimpleTreeModel must implement interface org.zkoss.zul.ext.TreeSelectionModel
at org.zkoss.zul.Tree.setModel(Tree.java:1446)
at org.zkforge.ckez.FilebrowserController.doAfterCompose(FilebrowserController.java:74)

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