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:203)
        at org.netbeans.modules.autoupdate.ui.wizards.InstallStep.doDownloadAndVerificationAndInstall(InstallStep.java:181)
        at org.netbeans.modules.autoupdate.ui.wizards.InstallStep.access$200(InstallStep.java:96)
        at org.netbeans.modules.autoupdate.ui.wizards.InstallStep$2.run(InstallStep.java:173)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:561)
        at org.openide.util.RequestProcessor$Processor.doEvaluate(RequestProcessor.java:1031)
        at org.openide.util.RequestProcessor$Task.waitFinished(RequestProcessor.java:723)
        at org.netbeans.modules.autoupdate.ui.wizards.InstallStep$1.propertyChange(InstallStep.java:157)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
        at java.awt.Component.firePropertyChange(Component.java:7868)
        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:561)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:986)