java.lang.NullPointerException
   at javax.swing.text.html.StyleSheet.getRule(StyleSheet.java:212)
   at javax.swing.text.html.StyleSheet$ViewAttributeSet.<init>(StyleSheet.java:2673)
   at javax.swing.text.html.StyleSheet.getViewAttributes(StyleSheet.java:348)
   at javax.swing.text.html.ParagraphView.setPropertiesFromAttributes(ParagraphView.java:101)
   at javax.swing.text.ParagraphView.<init>(ParagraphView.java:59)
   at javax.swing.text.html.ParagraphView.<init>(ParagraphView.java:54)
   at javax.swing.text.html.HTMLEditorKit$HTMLFactory.create(HTMLEditorKit.java:1149)
   at javax.swing.text.CompositeView.loadChildren(CompositeView.java:112)
   at javax.swing.text.CompositeView.setParent(CompositeView.java:139)
   at javax.swing.text.html.BlockView.setParent(BlockView.java:72)
   at javax.swing.text.html.HTMLEditorKit$HTMLFactory$BodyBlockView.setParent(HTMLEditorKit.java:1328)
   at javax.swing.text.CompositeView.replace(CompositeView.java:217)
   at javax.swing.text.BoxView.replace(BoxView.java:181)
   at javax.swing.text.CompositeView.loadChildren(CompositeView.java:114)
   at javax.swing.text.CompositeView.setParent(CompositeView.java:139)
   at javax.swing.text.html.BlockView.setParent(BlockView.java:72)
   at javax.swing.plaf.basic.BasicTextUI$RootView.setView(BasicTextUI.java:1328)
   at javax.swing.plaf.basic.BasicTextUI.setView(BasicTextUI.java:693)
   at javax.swing.plaf.basic.BasicTextUI.modelChanged(BasicTextUI.java:682)
   at javax.swing.plaf.basic.BasicEditorPaneUI.propertyChange(BasicEditorPaneUI.java:183)
   at javax.swing.plaf.basic.BasicTextUI$UpdateHandler.propertyChange(BasicTextUI.java:1814)
   at java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:335)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:327)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:263)
   at java.awt.Component.firePropertyChange(Component.java:8430)
   at javax.swing.JComponent.putClientProperty(JComponent.java:4087)
   at org.netbeans.modules.uihandler.Installer$SubmitInteractive$1.run(Installer.java:2286)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:301)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:744)
   at java.awt.EventQueue.access$400(EventQueue.java:97)
   at java.awt.EventQueue$3.run(EventQueue.java:697)
   at java.awt.EventQueue$3.run(EventQueue.java:691)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:714)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)