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:209)
   at org.netbeans.modules.autoupdate.ui.wizards.InstallStep.doDownloadAndVerificationAndInstall(InstallStep.java:187)
   at org.netbeans.modules.autoupdate.ui.wizards.InstallStep.access$200(InstallStep.java:101)
   at org.netbeans.modules.autoupdate.ui.wizards.InstallStep$2.run(InstallStep.java:179)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
   at org.openide.util.RequestProcessor$Processor.doEvaluate(RequestProcessor.java:2004)
   at org.openide.util.RequestProcessor$Task.waitFinished(RequestProcessor.java:1653)
   at org.netbeans.modules.autoupdate.ui.wizards.InstallStep$1.propertyChange(InstallStep.java:163)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
   at java.awt.Component.firePropertyChange(Component.java:8132)
   at org.netbeans.modules.autoupdate.ui.wizards.OperationPanel.access$000(OperationPanel.java:67)
   at org.netbeans.modules.autoupdate.ui.wizards.OperationPanel$1.run(OperationPanel.java:87)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1960)
Caused: org.openide.util.RequestProcessor$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:432)
   at org.netbeans.modules.autoupdate.ui.wizards.OperationPanel.addNotify(OperationPanel.java:85)
   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 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 org.netbeans.modules.autoupdate.ui.wizards.PanelBodyContainer.addNotify(PanelBodyContainer.java:93)
   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:374)
   at org.netbeans.core.windows.services.NbPresenter.initializePresenter(NbPresenter.java:422)
   at org.netbeans.core.windows.services.NbPresenter.addNotify(NbPresenter.java:449)
   at java.awt.Dialog.addNotify(Dialog.java:737)
   at org.netbeans.core.windows.services.NbPresenter.addNotify(NbPresenter.java:448)
   at java.awt.Dialog.conditionalShow(Dialog.java:887)
   at java.awt.Dialog.show(Dialog.java:1019)
   at org.netbeans.core.windows.services.NbPresenter.superShow(NbPresenter.java:1006)
   at org.netbeans.core.windows.services.NbPresenter.doShow(NbPresenter.java:1040)
   at org.netbeans.core.windows.services.NbPresenter.show(NbPresenter.java:1016)
   at java.awt.Component.show(Component.java:1563)
   at java.awt.Component.setVisible(Component.java:1515)
   at java.awt.Window.setVisible(Window.java:842)
   at java.awt.Dialog.setVisible(Dialog.java:986)
   at org.netbeans.core.NotifyExcPanel.updateState(NotifyExcPanel.java:392)
   at org.netbeans.core.NotifyExcPanel.access$400(NotifyExcPanel.java:97)
   at org.netbeans.core.NotifyExcPanel$2.run(NotifyExcPanel.java:323)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:138)
   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)