java.lang.AssertionError
	at org.openide.util.lookup.ProxyLookup$R.collectFires(ProxyLookup.java:542)
	at org.openide.util.lookup.ProxyLookup$WeakResult.collectFires(ProxyLookup.java:610)
	at org.openide.util.lookup.AbstractLookup.notifyListeners(AbstractLookup.java:469)
	at org.openide.util.lookup.ExcludingLookup$R.collectFires(ExcludingLookup.java:327)
	at org.openide.util.lookup.AbstractLookup.notifyListeners(AbstractLookup.java:469)
	at org.openide.util.lookup.SimpleProxyLookup$ProxyResult.collectFires(SimpleProxyLookup.java:274)
	at org.openide.util.lookup.SimpleProxyLookup.checkLookup(SimpleProxyLookup.java:82)
	at org.openide.util.lookup.SimpleProxyLookup.access$000(SimpleProxyLookup.java:36)
	at org.openide.util.lookup.SimpleProxyLookup$ProxyResult.checkResult(SimpleProxyLookup.java:161)
	at org.openide.util.lookup.SimpleProxyLookup$ProxyResult.beforeLookup(SimpleProxyLookup.java:245)
	at org.openide.util.lookup.ExcludingLookup$R.beforeLookup(ExcludingLookup.java:257)
	at org.openide.util.lookup.ProxyLookup$R.myBeforeLookup(ProxyLookup.java:562)
	at org.openide.util.lookup.ProxyLookup$R.computeResult(ProxyLookup.java:427)
	at org.openide.util.lookup.ProxyLookup$R.allInstances(ProxyLookup.java:400)
	at org.openide.util.lookup.ProxyLookup$R.collectFires(ProxyLookup.java:527)
	at org.openide.util.lookup.ProxyLookup$WeakResult.collectFires(ProxyLookup.java:610)
	at org.openide.util.lookup.AbstractLookup.notifyListeners(AbstractLookup.java:469)
	at org.openide.util.lookup.ExcludingLookup$R.collectFires(ExcludingLookup.java:327)
	at org.openide.util.lookup.AbstractLookup.notifyListeners(AbstractLookup.java:469)
	at org.openide.util.lookup.SimpleProxyLookup$ProxyResult.collectFires(SimpleProxyLookup.java:274)
	at org.openide.util.lookup.SimpleProxyLookup.checkLookup(SimpleProxyLookup.java:82)
	at org.openide.util.lookup.SimpleProxyLookup.lookup(SimpleProxyLookup.java:130)
	at org.netbeans.modules.xml.xam.ui.XAMUtils.isWritable(XAMUtils.java:109)
	at org.netbeans.modules.xml.schema.ui.nodes.categorized.CategoryNode.isEditable(CategoryNode.java:411)
	at org.netbeans.modules.xml.schema.ui.nodes.categorized.CategoryNode.createPasteTypes(CategoryNode.java:323)
	at org.openide.nodes.AbstractNode.getPasteTypes(AbstractNode.java:513)
	at org.openide.nodes.FilterNode.getPasteTypes(FilterNode.java:651)
	at org.openide.explorer.ExplorerActionsImpl.updatePasteTypes(ExplorerActionsImpl.java:317)
	at org.openide.explorer.ExplorerActionsImpl.updatePasteAction(ExplorerActionsImpl.java:307)
	at org.openide.explorer.ExplorerActionsImpl.access$300(ExplorerActionsImpl.java:66)
[catch] at org.openide.explorer.ExplorerActionsImpl$ActionStateUpdater.run(ExplorerActionsImpl.java:648)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
	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:1039)
	at java.awt.Dialog$3.run(Dialog.java:1091)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.awt.Dialog.show(Dialog.java:1089)
	at org.netbeans.core.windows.services.NbPresenter.superShow(NbPresenter.java:812)
	at org.netbeans.core.windows.services.NbPresenter.doShow(NbPresenter.java:846)
	at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:834)
	at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:82)
	at org.openide.util.Mutex.doEventAccess(Mutex.java:1201)
	at org.openide.util.Mutex.readAccess(Mutex.java:220)
	at org.netbeans.core.windows.services.NbPresenter.show(NbPresenter.java:819)
	at java.awt.Component.show(Component.java:1419)
	at java.awt.Component.setVisible(Component.java:1372)
	at java.awt.Window.setVisible(Window.java:801)
	at java.awt.Dialog.setVisible(Dialog.java:979)
	at org.netbeans.modules.xml.refactoring.impl.UndoRedoProgress$1.run(UndoRedoProgress.java:80)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
	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)