java.lang.NullPointerException
        at org.netbeans.core.windows.view.ui.toolbars.ToolbarContainer.getName(ToolbarContainer.java:165)
        at com.sun.java.swing.plaf.gtk.GTKStyle.getInsets(GTKStyle.java:274)
        at javax.swing.plaf.synth.SynthStyle.installDefaults(SynthStyle.java:896)
        at javax.swing.plaf.synth.SynthLookAndFeel.updateStyle(SynthLookAndFeel.java:276)
        at javax.swing.plaf.synth.SynthPanelUI.updateStyle(SynthPanelUI.java:70)
        at javax.swing.plaf.synth.SynthPanelUI.installDefaults(SynthPanelUI.java:57)
        at javax.swing.plaf.basic.BasicPanelUI.installUI(BasicPanelUI.java:39)
        at javax.swing.plaf.synth.SynthPanelUI.installUI(SynthPanelUI.java:37)
        at javax.swing.JComponent.setUI(JComponent.java:673)
        at javax.swing.JPanel.setUI(JPanel.java:136)
        at javax.swing.JPanel.updateUI(JPanel.java:109)
        at javax.swing.JPanel.<init>(JPanel.java:69)
        at javax.swing.JPanel.<init>(JPanel.java:78)
        at org.netbeans.core.windows.view.ui.toolbars.ToolbarContainer.<init>(ToolbarContainer.java:100)
        at org.netbeans.core.windows.view.ui.toolbars.ToolbarConfiguration.refresh(ToolbarConfiguration.java:277)
        at org.netbeans.core.windows.view.ui.toolbars.ToolbarConfiguration$.run(ToolbarConfiguration.java:448)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        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)