java.lang.AssertionError: OperationSupport cannot be null because OperationContainer contains elements: [] and invalid elements []
   at org.netbeans.modules.autoupdate.ui.wizards.InstallStep.handleDownload(InstallStep.java:206)
   at org.netbeans.modules.autoupdate.ui.wizards.InstallStep.doDownloadAndVerificationAndInstall(InstallStep.java:184)
   at org.netbeans.modules.autoupdate.ui.wizards.InstallStep.access$200(InstallStep.java:98)
   at org.netbeans.modules.autoupdate.ui.wizards.InstallStep$2.run(InstallStep.java:176)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1369)
   at org.openide.util.RequestProcessor$Processor.doEvaluate(RequestProcessor.java:1951)
   at org.openide.util.RequestProcessor$Task.waitFinished(RequestProcessor.java:1600)
   at org.netbeans.modules.autoupdate.ui.wizards.InstallStep$1.propertyChange(InstallStep.java:160)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
   at java.awt.Component.firePropertyChange(Component.java:8213)
   at org.netbeans.modules.autoupdate.ui.wizards.OperationPanel.access$000(OperationPanel.java:61)
   at org.netbeans.modules.autoupdate.ui.wizards.OperationPanel$1.run(OperationPanel.java:81)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1369)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1907)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.AssertionError: OperationSupport cannot be null because OperationContainer contains elements: [] and invalid elements []
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:379)
   at org.netbeans.modules.autoupdate.ui.wizards.OperationPanel.addNotify(OperationPanel.java:79)
   at java.awt.Container.addNotify(Container.java:2622)
   at javax.swing.JComponent.addNotify(JComponent.java:4673)
   at java.awt.Container.addNotify(Container.java:2622)
   at javax.swing.JComponent.addNotify(JComponent.java:4673)
   at java.awt.Container.addNotify(Container.java:2622)
   at javax.swing.JComponent.addNotify(JComponent.java:4673)
   at java.awt.Container.addNotify(Container.java:2622)
   at javax.swing.JComponent.addNotify(JComponent.java:4673)
   at org.netbeans.modules.autoupdate.ui.wizards.PanelBodyContainer.addNotify(PanelBodyContainer.java:90)
   at java.awt.Container.addImpl(Container.java:1068)
   at java.awt.Container.add(Container.java:927)
   at org.netbeans.core.windows.services.NbPresenter.initializeMessage(NbPresenter.java:371)
   at org.netbeans.core.windows.services.NbPresenter.initializePresenter(NbPresenter.java:419)
   at org.netbeans.core.windows.services.NbPresenter.addNotify(NbPresenter.java:446)
   at java.awt.Dialog.addNotify(Dialog.java:736)
   at org.netbeans.core.windows.services.NbPresenter.addNotify(NbPresenter.java:445)
   at java.awt.Dialog.conditionalShow(Dialog.java:886)
   at java.awt.Dialog.show(Dialog.java:1034)
   at org.netbeans.core.windows.services.NbPresenter.superShow(NbPresenter.java:1003)
   at org.netbeans.core.windows.services.NbPresenter.doShow(NbPresenter.java:1037)
   at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:1025)
   at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:118)
   at org.openide.util.Mutex.doEventAccess(Mutex.java:1355)
   at org.openide.util.Mutex.readAccess(Mutex.java:268)
   at org.netbeans.core.windows.services.NbPresenter.show(NbPresenter.java:1010)
   at java.awt.Component.show(Component.java:1563)
   at java.awt.Component.setVisible(Component.java:1515)
   at java.awt.Window.setVisible(Window.java:841)
   at java.awt.Dialog.setVisible(Dialog.java:985)
   at org.netbeans.core.NotifyExcPanel.updateState(NotifyExcPanel.java:388)
   at org.netbeans.core.NotifyExcPanel.access$400(NotifyExcPanel.java:94)
   at org.netbeans.core.NotifyExcPanel$2.run(NotifyExcPanel.java:319)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:633)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:133)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)