java.lang.IllegalStateException: Problem in some module which uses Window System: Window System API is required to be called from AWT thread only, see http://core.netbeans.org/proposals/threading/
   at org.netbeans.core.windows.WindowManagerImpl.warnIfNotInEDT(WindowManagerImpl.java:1542)
   at org.netbeans.core.windows.WindowManagerImpl.topComponentActivatedNodesChanged(WindowManagerImpl.java:1219)
   at org.openide.windows.TopComponent.setActivatedNodesImpl(TopComponent.java:364)
   at org.openide.windows.TopComponent.setActivatedNodes(TopComponent.java:325)
   at org.netbeans.modules.xml.schema.abe.ComponentSelectionManager.selectComponent(ComponentSelectionManager.java:123)
   at org.netbeans.modules.xml.schema.abe.ComponentSelectionManager.addToSelectedComponents(ComponentSelectionManager.java:96)
   at org.netbeans.modules.xml.schema.abe.ComponentSelectionManager.setSelectedComponent(ComponentSelectionManager.java:83)
   at org.netbeans.modules.xml.schema.abe.InstanceDesignerPanel.initialize(InstanceDesignerPanel.java:167)
   at org.netbeans.modules.xml.schema.abe.InstanceDesignerPanel.<init>(InstanceDesignerPanel.java:99)
   at org.netbeans.modules.xml.schema.abe.InstanceDesignerPanel.<init>(InstanceDesignerPanel.java:91)
   at org.netbeans.modules.xml.schema.multiview.SchemaABEViewMultiViewElement.recreateUI(SchemaABEViewMultiViewElement.java:251)
   at org.netbeans.modules.xml.schema.multiview.SchemaABEViewMultiViewElement.propertyChange(SchemaABEViewMultiViewElement.java:125)
   at sun.reflect.GeneratedMethodAccessor40.invoke(GeneratedMethodAccessor40.java:0)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:450)
   at $Proxy12.propertyChange(.java:0)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
   at org.netbeans.modules.xml.xam.AbstractModel$Transaction.fireCompleteEventSet(AbstractModel.java:488)
   at org.netbeans.modules.xml.xam.AbstractModel$Transaction.fireEvents(AbstractModel.java:474)
   at org.netbeans.modules.xml.xam.AbstractModel.endTransaction(AbstractModel.java:321)
   at org.netbeans.modules.xml.xam.AbstractModel.endTransaction(AbstractModel.java:313)
   at org.netbeans.modules.xml.xam.AbstractModel.sync(AbstractModel.java:260)
   at org.netbeans.modules.xml.axi.impl.AXIModelImpl.sync(AXIModelImpl.java:206)
   at org.netbeans.modules.xml.xam.AbstractModel$1.run(AbstractModel.java:652)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:573)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1005)