java.lang.NullPointerException
   at javax.swing.BoxLayout.preferredLayoutSize(BoxLayout.java:302)
   at java.awt.Container.preferredSize(Container.java:1794)
   at java.awt.Container.getPreferredSize(Container.java:1778)
   at javax.swing.JComponent.getPreferredSize(JComponent.java:1664)
   at javax.swing.ViewportLayout.preferredLayoutSize(ViewportLayout.java:96)
   at java.awt.Container.preferredSize(Container.java:1794)
   at java.awt.Container.getPreferredSize(Container.java:1778)
   at javax.swing.JComponent.getPreferredSize(JComponent.java:1664)
   at javax.swing.ScrollPaneLayout.layoutContainer(ScrollPaneLayout.java:739)
   at java.awt.Container.layout(Container.java:1508)
   at java.awt.Container.doLayout(Container.java:1497)
   at java.awt.Container.validateTree(Container.java:1693)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validate(Container.java:1628)
   at org.netbeans.core.windows.view.ui.DesktopImpl$LayeredLayout.layoutContainer(DesktopImpl.java:554)
   at java.awt.Container.layout(Container.java:1508)
   at java.awt.Container.doLayout(Container.java:1497)
   at java.awt.Container.validateTree(Container.java:1693)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validate(Container.java:1628)
   at javax.swing.RepaintManager$3.run(RepaintManager.java:704)
   at javax.swing.RepaintManager$3.run(RepaintManager.java:702)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
   at javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:701)
   at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1719)
   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$1.doIntersectionPrivilege(ProtectionDomain.java:75)
   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)