java.lang.NullPointerException
   at org.netbeans.modules.xml.schema.model.impl.SchemaComponentImpl.populateChildren(SchemaComponentImpl.java:110)
   at org.netbeans.modules.xml.xam.AbstractComponent._getChildren(AbstractComponent.java:188)
   at org.netbeans.modules.xml.xam.AbstractComponent.getChildren(AbstractComponent.java:146)
   at org.netbeans.modules.xml.schema.model.visitor.DeepSchemaVisitor.visitChildren(DeepSchemaVisitor.java:269)
   at org.netbeans.modules.xml.schema.model.visitor.DeepSchemaVisitor.visit(DeepSchemaVisitor.java:241)
   at org.netbeans.modules.xml.schema.model.impl.SimpleTypeRestrictionImpl.accept(SimpleTypeRestrictionImpl.java:78)
   at org.netbeans.modules.xml.schema.model.visitor.DeepSchemaVisitor.visitChildren(DeepSchemaVisitor.java:270)
   at org.netbeans.modules.xml.schema.model.visitor.DeepSchemaVisitor.visit(DeepSchemaVisitor.java:81)
   at org.netbeans.modules.xml.schema.model.impl.GlobalSimpleTypeImpl.accept(GlobalSimpleTypeImpl.java:122)
   at org.netbeans.modules.xml.axi.impl.AXIModelBuilderQuery.affectsModel(AXIModelBuilderQuery.java:101)
   at org.netbeans.modules.xml.axi.impl.SchemaModelListener.isValidEvent(SchemaModelListener.java:110)
   at org.netbeans.modules.xml.axi.impl.SchemaModelListener.propertyChange(SchemaModelListener.java:80)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
   at org.netbeans.modules.xml.xam.AbstractModel$Transaction.fireCompleteEventSet(AbstractModel.java:549)
   at org.netbeans.modules.xml.xam.AbstractModel$Transaction.fireEvents(AbstractModel.java:535)
   at org.netbeans.modules.xml.xam.AbstractModel.endTransaction(AbstractModel.java:359)
   at org.netbeans.modules.xml.xam.AbstractModel.endTransaction(AbstractModel.java:350)
   at org.netbeans.modules.xml.xam.AbstractModel.sync(AbstractModel.java:286)
   at org.netbeans.modules.xml.schema.SchemaEditorSupport$4.run(SchemaEditorSupport.java:615)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1957)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:422)
   at org.netbeans.modules.xml.schema.SchemaEditorSupport.syncModel(SchemaEditorSupport.java:610)
   at org.netbeans.modules.xml.schema.multiview.SchemaSourceMultiViewElement.componentHidden(SchemaSourceMultiViewElement.java:328)
   at org.netbeans.core.multiview.MultiViewPeer.peerComponentHidden(MultiViewPeer.java:216)
   at org.netbeans.core.multiview.MultiViewCloneableTopComponent.componentHidden(MultiViewCloneableTopComponent.java:127)
   at org.openide.windows.WindowManager.componentHidden(WindowManager.java:348)
   at org.netbeans.core.windows.WindowManagerImpl.componentHidden(WindowManagerImpl.java:1040)
   at org.netbeans.core.windows.view.DefaultView.changeGUI(DefaultView.java:494)
   at org.netbeans.core.windows.ViewRequestor.dispatchRequest(ViewRequestor.java:272)
   at org.netbeans.core.windows.ViewRequestor.processRequest(ViewRequestor.java:248)
   at org.netbeans.core.windows.ViewRequestor.postRequest(ViewRequestor.java:186)
   at org.netbeans.core.windows.ViewRequestor.scheduleRequest(ViewRequestor.java:126)
   at org.netbeans.core.windows.Central.setModeSelectedTopComponent(Central.java:733)
   at org.netbeans.core.windows.Central.userActivatedTopComponent(Central.java:1904)
   at org.netbeans.core.windows.view.DefaultView.userSelectedTab(DefaultView.java:651)
   at org.netbeans.core.windows.view.ui.TabbedHandler.stateChanged(TabbedHandler.java:294)
   at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:133)
   at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:119)
   at org.netbeans.core.windows.view.ui.tabcontrol.TabbedAdapter.fireStateChanged(TabbedAdapter.java:451)
   at org.netbeans.core.windows.view.ui.tabcontrol.TabbedAdapter.access$000(TabbedAdapter.java:83)
   at org.netbeans.core.windows.view.ui.tabcontrol.TabbedAdapter$1.stateChanged(TabbedAdapter.java:101)
   at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:133)
   at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:119)
   at org.netbeans.swing.tabcontrol.plaf.DefaultTabSelectionModel.setSelectedIndex(DefaultTabSelectionModel.java:111)
   at org.netbeans.swing.tabcontrol.plaf.BasicTabDisplayerUI$BasicDisplayerMouseListener.performCommand(BasicTabDisplayerUI.java:727)
   at org.netbeans.swing.tabcontrol.plaf.BasicTabDisplayerUI$BasicDisplayerMouseListener.potentialCommand(BasicTabDisplayerUI.java:716)
   at org.netbeans.swing.tabcontrol.plaf.BasicTabDisplayerUI$BasicDisplayerMouseListener.mousePressed(BasicTabDisplayerUI.java:695)
   at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:262)
   at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:262)
   at java.awt.Component.processMouseEvent(Component.java:6260)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
   at java.awt.Component.processEvent(Component.java:6028)
   at java.awt.Container.processEvent(Container.java:2041)
   at java.awt.Component.dispatchEventImpl(Component.java:4630)
   at java.awt.Container.dispatchEventImpl(Container.java:2099)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4574)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4235)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4168)
   at java.awt.Container.dispatchEventImpl(Container.java:2085)
   at java.awt.Window.dispatchEventImpl(Window.java:2478)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:137)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)