java.lang.NullPointerException
        at org.netbeans.modules.search.BasicSearchForm.updateWarningBackrefState(BasicSearchForm.java:580)
        at org.netbeans.modules.search.BasicSearchForm.initInteraction(BasicSearchForm.java:470)
        at org.netbeans.modules.search.BasicSearchForm.<init>(BasicSearchForm.java:130)
        at org.netbeans.modules.search.SearchPanel.<init>(SearchPanel.java:174)
        at org.netbeans.modules.search.SearchPanel.<init>(SearchPanel.java:130)
        at org.netbeans.modules.search.FindInFilesAction.performAction(FindInFilesAction.java:335)
        at org.netbeans.modules.search.FindInFilesAction.access$100(FindInFilesAction.java:94)
        at org.netbeans.modules.search.FindInFilesAction$LookupSensitive.actionPerformed(FindInFilesAction.java:434)
        at org.openide.util.actions.CallbackSystemAction$DelegateAction$1.run(CallbackSystemAction.java:592)
        at org.netbeans.modules.openide.util.ActionsBridge.doPerformAction(ActionsBridge.java:77)
        at org.openide.util.actions.CallbackSystemAction$DelegateAction.actionPerformed(CallbackSystemAction.java:596)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
        at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
        at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1220)
        at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1261)
        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:4299)
        at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:3963)
        at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:3893)
        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:284)
        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)