Javatest 4.2_b07

Start Harness. Load WD. Open Configuration. Select "Specify Tests" -> "Yes". Click on the "Tests to Run" question. Nothing but exception in console is shown:

Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: javax.swing.tree.DefaultTreeModel cannot be cast to com.sun.interview.wizard.TreeQuestionRenderer$TQModel
   at com.sun.interview.wizard.TreeQuestionRenderer$TQRenderer.getTreeCellRendererComponent(TreeQuestionRenderer.java:416)
   at javax.swing.plaf.basic.BasicTreeUI$NodeDimensionsHandler.getNodeDimensions(BasicTreeUI.java:2717)
   at javax.swing.tree.AbstractLayoutCache.getNodeDimensions(AbstractLayoutCache.java:475)
   at javax.swing.tree.VariableHeightLayoutCache$TreeStateNode.updatePreferredSize(VariableHeightLayoutCache.java:1342)
   at javax.swing.tree.VariableHeightLayoutCache.updateNodeSizes(VariableHeightLayoutCache.java:900)
   at javax.swing.tree.VariableHeightLayoutCache.invalidateSizes(VariableHeightLayoutCache.java:354)
   at javax.swing.plaf.basic.BasicTreeUI.setCellRenderer(BasicTreeUI.java:372)
   at javax.swing.plaf.basic.BasicTreeUI$Handler.propertyChange(BasicTreeUI.java:3326)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
   at java.awt.Component.firePropertyChange(Component.java:7961)
   at javax.swing.JTree.setCellRenderer(JTree.java:749)
   at com.sun.interview.wizard.TreeQuestionRenderer$TQTree.<init>(TreeQuestionRenderer.java:96)
   at com.sun.interview.wizard.TreeQuestionRenderer.getQuestionRendererComponent(TreeQuestionRenderer.java:61)
   at com.sun.interview.wizard.QuestionPanel.showQuestion(QuestionPanel.java:448)
   at com.sun.interview.wizard.QuestionPanel$Listener.currentQuestionChanged(QuestionPanel.java:662)
   at com.sun.interview.Interview.notifyCurrentQuestionChanged(Interview.java:1824)
   at com.sun.interview.Interview.setCurrentQuestion(Interview.java:923)