java.lang.IllegalStateException: The data object MultiFileObject@1d6b6fa[Templates/Project/Samples/ApiSupport] is invalid; you may not call getNodeDelegate on it any more; see #17020 and please fix your code
        at org.openide.loaders.DataObject.getNodeDelegate(DataObject.java:267)
        at org.netbeans.modules.project.ui.TemplatesPanel$CategoriesChildren.createNodes(TemplatesPanel.java:220)
        at org.netbeans.modules.project.ui.TemplatesPanel$CategoriesChildren.createNodes(TemplatesPanel.java:192)
        at org.openide.nodes.Children$Keys$KE.nodes(Children.java:1474)
        at org.openide.nodes.ChildrenArray.nodesFor(ChildrenArray.java:168)
        at org.openide.nodes.EntrySupport$Default$Info.nodes(EntrySupport.java:924)
        at org.openide.nodes.EntrySupport$Default.updateAdd(EntrySupport.java:491)
        at org.openide.nodes.EntrySupport$Default.setEntries(EntrySupport.java:324)
        at org.openide.nodes.Children$Keys$2.run(Children.java:1368)
        at org.openide.util.Mutex.leaveImpl(Mutex.java:902)
        at org.openide.util.Mutex.leave(Mutex.java:835)
        at org.openide.util.Mutex.readAccess(Mutex.java:364)
        at org.openide.explorer.view.VisualizerNode$QP.run(VisualizerNode.java:660)
        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:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:177)
        at java.awt.Dialog$1.run(Dialog.java:1045)
        at java.awt.Dialog$3.run(Dialog.java:1097)
        at java.security.AccessController.doPrivileged(AccessController.java:0)
        at java.awt.Dialog.show(Dialog.java:1095)
        at org.netbeans.core.windows.services.NbPresenter.superShow(NbPresenter.java:863)
        at org.netbeans.core.windows.services.NbPresenter.doShow(NbPresenter.java:897)
        at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:885)
        at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:109)
        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:870)
        at java.awt.Component.show(Component.java:1422)
        at java.awt.Component.setVisible(Component.java:1375)
        at java.awt.Window.setVisible(Window.java:806)
        at java.awt.Dialog.setVisible(Dialog.java:985)
        at org.netbeans.core.NotifyExcPanel.updateState(NotifyExcPanel.java:379)
        at org.netbeans.core.NotifyExcPanel.access$400(NotifyExcPanel.java:91)
        at org.netbeans.core.NotifyExcPanel$2.run(NotifyExcPanel.java:311)
        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:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:177)
        at java.awt.Dialog$1.run(Dialog.java:1045)
        at java.awt.Dialog$3.run(Dialog.java:1097)
        at java.security.AccessController.doPrivileged(AccessController.java:0)
        at java.awt.Dialog.show(Dialog.java:1095)
        at org.netbeans.core.windows.services.NbPresenter.superShow(NbPresenter.java:863)
        at org.netbeans.core.windows.services.NbPresenter.doShow(NbPresenter.java:897)
        at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:885)
        at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:109)
        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:870)
        at java.awt.Component.show(Component.java:1422)
        at java.awt.Component.setVisible(Component.java:1375)
        at java.awt.Window.setVisible(Window.java:806)
        at java.awt.Dialog.setVisible(Dialog.java:985)
        at org.openide.loaders.TemplateWizard.instantiateImpl(TemplateWizard.java:502)
        at org.openide.loaders.TemplateWizard.instantiate(TemplateWizard.java:381)
        at org.netbeans.modules.project.ui.actions.NewFile.doPerform(NewFile.java:153)
        at org.netbeans.modules.project.ui.actions.NewFile.access$200(NewFile.java:80)
        at org.netbeans.modules.project.ui.actions.NewFile$PopupListener.actionPerformed(NewFile.java:348)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
        at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
        at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1220)
        at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1261)
        at java.awt.Component.processMouseEvent(Component.java:6041)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
        at java.awt.Component.processEvent(Component.java:5806)
        at java.awt.Container.processEvent(Container.java:2058)
        at java.awt.Component.dispatchEventImpl(Component.java:4413)
        at java.awt.Container.dispatchEventImpl(Container.java:2116)
        at java.awt.Component.dispatchEvent(Component.java:4243)
        at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4322)
        at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:3986)
        at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:3916)
        at java.awt.Container.dispatchEventImpl(Container.java:2102)
        at java.awt.Window.dispatchEventImpl(Window.java:2440)
        at java.awt.Component.dispatchEvent(Component.java:4243)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)