java.lang.NullPointerException
   at org.netbeans.modules.editor.impl.CustomizableSideBar$WestSidebarHolder.updateUIConfig(CustomizableSideBar.java:335)
   at org.netbeans.modules.editor.impl.CustomizableSideBar$WestSidebarHolder.addNotify(CustomizableSideBar.java:310)
   at java.awt.Container.addNotify(Container.java:2773)
   at javax.swing.JComponent.addNotify(JComponent.java:4740)
   at java.awt.Container.addNotify(Container.java:2773)
   at javax.swing.JComponent.addNotify(JComponent.java:4740)
   at java.awt.Container.addNotify(Container.java:2773)
   at javax.swing.JComponent.addNotify(JComponent.java:4740)
   at java.awt.Container.addImpl(Container.java:1121)
   at java.awt.Container.add(Container.java:973)
   at org.openide.text.CloneableEditorInitializer.initCustomEditor(CloneableEditorInitializer.java:546)
   at org.openide.text.CloneableEditorInitializer.initCustomEditorAndDecorationsInEDT(CloneableEditorInitializer.java:596)
   at org.openide.text.CloneableEditorInitializer.run(CloneableEditorInitializer.java:344)
   at org.openide.text.CloneableEditorInitializer.processPendingEDTRequests(CloneableEditorInitializer.java:158)
   at org.openide.text.CloneableEditorInitializer$1.run(CloneableEditorInitializer.java:107)
   at org.netbeans.core.windows.WindowManagerImpl$Exclusive$1.run(WindowManagerImpl.java:1563)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
   at java.awt.EventQueue.access$500(EventQueue.java:97)
   at java.awt.EventQueue$3.run(EventQueue.java:709)
   at java.awt.EventQueue$3.run(EventQueue.java:703)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)