java.lang.NullPointerException
   at org.netbeans.lib.editor.util.swing.DocumentUtilities.getMimeType(DocumentUtilities.java:867)
   at org.netbeans.editor.EditorUI.getDefaultColoring(EditorUI.java:677)
   at org.netbeans.modules.editor.completion.HTMLDocView.setBodyFontInCSS(HTMLDocView.java:186)
   at org.netbeans.modules.editor.completion.HTMLDocView.createDefaultEditorKit(HTMLDocView.java:175)
   at javax.swing.JEditorPane.getEditorKit(JEditorPane.java:954)
   at javax.swing.plaf.basic.BasicEditorPaneUI.getEditorKit(BasicEditorPaneUI.java:96)
   at javax.swing.plaf.basic.BasicTextUI.installUI(BasicTextUI.java:785)
   at javax.swing.plaf.basic.BasicEditorPaneUI.installUI(BasicEditorPaneUI.java:72)
   at javax.swing.JComponent.setUI(JComponent.java:662)
   at javax.swing.text.JTextComponent.setUI(JTextComponent.java:322)
   at javax.swing.text.JTextComponent.updateUI(JTextComponent.java:332)
   at javax.swing.text.JTextComponent.<init>(JTextComponent.java:306)
   at javax.swing.JEditorPane.<init>(JEditorPane.java:179)
   at org.netbeans.modules.editor.completion.HTMLDocView.<init>(HTMLDocView.java:84)
   at org.netbeans.modules.editor.completion.DocumentationScrollPane.<init>(DocumentationScrollPane.java:130)
   at org.netbeans.modules.editor.completion.CompletionLayout$DocPopup.show(CompletionLayout.java:441)
   at org.netbeans.modules.editor.completion.CompletionLayout.showDocumentation(CompletionLayout.java:180)
   at org.netbeans.modules.editor.completion.CompletionImpl$9.run(CompletionImpl.java:1127)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:153)
   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)