java.lang.NullPointerException
   at java.awt.Container.addNotify(Container.java:2582)
   at javax.swing.JComponent.addNotify(JComponent.java:4685)
   at java.awt.Container.addNotify(Container.java:2578)
   at javax.swing.JComponent.addNotify(JComponent.java:4685)
   at java.awt.Container.addNotify(Container.java:2578)
   at javax.swing.JComponent.addNotify(JComponent.java:4685)
   at javax.swing.JRootPane.addNotify(JRootPane.java:739)
   at java.awt.Container.addNotify(Container.java:2578)
   at java.awt.Window.addNotify(Window.java:663)
   at java.awt.Dialog.addNotify(Dialog.java:743)
   at org.netbeans.core.windows.services.NbPresenter.addNotify(NbPresenter.java:453)
   at java.awt.Window.pack(Window.java:704)
   at org.netbeans.core.windows.services.NbPresenter.initialize(NbPresenter.java:263)
   at org.netbeans.core.windows.services.NbPresenter.<init>(NbPresenter.java:193)
   at org.netbeans.core.windows.services.NbDialog.<init>(NbDialog.java:67)
   at org.netbeans.core.windows.services.DialogDisplayerImpl$1AWTQuery.showDialog(DialogDisplayerImpl.java:219)
   at org.netbeans.core.windows.services.DialogDisplayerImpl.notify(DialogDisplayerImpl.java:261)
   at org.netbeans.core.windows.services.DialogDisplayerImpl.notify(DialogDisplayerImpl.java:158)
   at org.netbeans.modules.maven.ActionProviderImpl$ShowProblemsAction.actionPerformed(ActionProviderImpl.java:621)
   at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
   at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
   at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
   at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
   at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
   at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1223)
   at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1264)
   at java.awt.Component.processMouseEvent(Component.java:6267)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
   at java.awt.Component.processEvent(Component.java:6032)
   at java.awt.Container.processEvent(Container.java:2041)
   at java.awt.Component.dispatchEventImpl(Component.java:4630)
   at java.awt.Container.dispatchEventImpl(Container.java:2099)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4577)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4238)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4168)
   at java.awt.Container.dispatchEventImpl(Container.java:2085)
   at java.awt.Window.dispatchEventImpl(Window.java:2478)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:148)
   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)