java.lang.NullPointerException
        at org.netbeans.modules.form.BindingCustomizer.updateColumnSelector(BindingCustomizer.java:1241)
        at org.netbeans.modules.form.BindingCustomizer.treeComboActionPerformed(BindingCustomizer.java:1090)
        at org.netbeans.modules.form.BindingCustomizer.access$1300(BindingCustomizer.java:82)
        at org.netbeans.modules.form.BindingCustomizer$FormListener.actionPerformed(BindingCustomizer.java:1030)
        at javax.swing.JComboBox.fireActionEvent(JComboBox.java:1240)
        at javax.swing.JComboBox.setSelectedItem(JComboBox.java:567)
        at org.netbeans.modules.form.BindingCustomizer.setBindingToUI(BindingCustomizer.java:396)
        at org.netbeans.modules.form.BindingCustomizer.setBinding(BindingCustomizer.java:273)
        at org.netbeans.modules.form.editors.TableCustomizer.setContext(TableCustomizer.java:1276)
        at org.netbeans.modules.form.RADComponentNode.createCustomizer(RADComponentNode.java:460)
        at org.netbeans.modules.form.FormNode.getCustomizer(FormNode.java:116)
        at org.netbeans.core.windows.services.NodeOperationImpl.customize(NodeOperationImpl.java:111)
        at org.openide.actions.CustomizeAction.performAction(CustomizeAction.java:56)
        at org.openide.util.actions.NodeAction$DelegateAction$1.run(NodeAction.java:581)
        at org.netbeans.modules.openide.util.ActionsBridge.doPerformAction(ActionsBridge.java:77)
        at org.openide.util.actions.NodeAction$DelegateAction.actionPerformed(NodeAction.java:577)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
        at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
        at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1225)
        at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1266)
        at java.awt.Component.processMouseEvent(Component.java:6134)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
        at java.awt.Component.processEvent(Component.java:5899)
        at java.awt.Container.processEvent(Container.java:2023)
        at java.awt.Component.dispatchEventImpl(Component.java:4501)
        at java.awt.Container.dispatchEventImpl(Container.java:2081)
        at java.awt.Component.dispatchEvent(Component.java:4331)
        at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4301)
        at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:3965)
        at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:3895)
        at java.awt.Container.dispatchEventImpl(Container.java:2067)
        at java.awt.Window.dispatchEventImpl(Window.java:2458)
        at java.awt.Component.dispatchEvent(Component.java:4331)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)