java.lang.NullPointerException
   at javax.swing.SizeRequirements.calculateAlignedPositions(SizeRequirements.java:461)
   at javax.swing.BoxLayout.layoutContainer(BoxLayout.java:434)
   at java.awt.Container.layout(Container.java:1503)
   at java.awt.Container.doLayout(Container.java:1492)
   at java.awt.Container.validateTree(Container.java:1688)
   at java.awt.Container.validateTree(Container.java:1697)
   at java.awt.Container.validateTree(Container.java:1697)
   at java.awt.Container.validateTree(Container.java:1697)
   at java.awt.Container.validateTree(Container.java:1697)
   at java.awt.Container.validateTree(Container.java:1697)
   at java.awt.Container.validateTree(Container.java:1697)
   at java.awt.Container.validateTree(Container.java:1697)
   at java.awt.Container.validate(Container.java:1623)
   at org.netbeans.core.windows.view.ui.DesktopImpl$LayeredLayout.layoutContainer(DesktopImpl.java:530)
   at java.awt.Container.layout(Container.java:1503)
   at java.awt.Container.doLayout(Container.java:1492)
   at java.awt.Container.validateTree(Container.java:1688)
   at java.awt.Container.validateTree(Container.java:1697)
   at java.awt.Container.validateTree(Container.java:1697)
   at java.awt.Container.validateTree(Container.java:1697)
   at java.awt.Container.validateTree(Container.java:1697)
   at java.awt.Container.validate(Container.java:1623)
   at javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:653)
   at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1620)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:705)
   at java.awt.EventQueue.access$000(EventQueue.java:101)
   at java.awt.EventQueue$3.run(EventQueue.java:666)
   at java.awt.EventQueue$3.run(EventQueue.java:664)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:675)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:158)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)