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.topComponentRequestActive(WindowManagerImpl.java:1166)
        at org.openide.windows.TopComponent.requestActive(TopComponent.java:789)
        at org.netbeans.modules.xml.schema.abe.ComponentSelectionManager.selectComponent(ComponentSelectionManager.java:128)
        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.GeneratedMethodAccessor24.invoke(GeneratedMethodAccessor24.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 $Proxy10.propertyChange(.java:0)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
        at org.netbeans.modules.xml.xam.AbstractModel.setState(AbstractModel.java:195)
        at org.netbeans.modules.xml.xam.AbstractModel.refresh(AbstractModel.java:292)
        at org.netbeans.modules.xml.xam.AbstractModel.sync(AbstractModel.java:277)
        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)