java.lang.NullPointerException
   at org.netbeans.modules.css.visual.DocumentViewModel.update(DocumentViewModel.java:151)
   at org.netbeans.modules.css.visual.DocumentViewModel.<init>(DocumentViewModel.java:106)
   at org.netbeans.modules.css.visual.DocumentViewPanel$4.run(DocumentViewPanel.java:232)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1454)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2036)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:424)
   at org.netbeans.modules.css.visual.DocumentViewPanel.contextChanged(DocumentViewPanel.java:219)
   at org.netbeans.modules.css.visual.DocumentViewPanel.access$000(DocumentViewPanel.java:105)
   at org.netbeans.modules.css.visual.DocumentViewPanel$1.resultChanged(DocumentViewPanel.java:136)
   at org.openide.util.lookup.ProxyLookup$1Notify.run(ProxyLookup.java:181)
   at org.openide.util.lookup.ProxyLookup.setLookups(ProxyLookup.java:190)
   at org.openide.util.lookup.ProxyLookup.setLookups(ProxyLookup.java:126)
   at org.netbeans.modules.css.visual.CssStylesPanel$ModifiableLookup.updateLookup(CssStylesPanel.java:235)
   at org.netbeans.modules.css.visual.CssStylesPanel.setContext(CssStylesPanel.java:169)
   at org.netbeans.modules.css.visual.api.CssStylesTC.setContext(CssStylesTC.java:108)
   at org.netbeans.modules.css.visual.CssStylesTCController.openCssStyles(CssStylesTCController.java:172)
   at org.netbeans.modules.css.visual.CssStylesTCController.access$200(CssStylesTCController.java:67)
   at org.netbeans.modules.css.visual.CssStylesTCController$1$1.run(CssStylesTCController.java:138)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:721)
   at java.awt.EventQueue.access$200(EventQueue.java:103)
   at java.awt.EventQueue$3.run(EventQueue.java:682)
   at java.awt.EventQueue$3.run(EventQueue.java:680)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:691)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:158)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)