java.lang.IllegalStateException: NbEditorDocument.createEditor(): ui=javax.swing.plaf.basic.BasicEditorPaneUI@b29aa5, kit=javax.swing.JEditorPane$PlainEditorKit@1c6fb4f, pane=org.openide.text.QuietEditorPane[,0,0,0x0,invalid,layout=javax.swing.plaf.basic.BasicTextUI$UpdateHandler,alignmentX=0.0,alignmentY=0.0,border=javax.swing.plaf.basic.BasicBorders$MarginBorder@46f6e4,flags=296,maximumSize=,minimumSize=,preferredSize=,caretColor=sun.swing.PrintColorUIResource[r=51,g=51,b=51],disabledTextColor=javax.swing.plaf.ColorUIResource[r=184,g=207,b=229],editable=true,margin=javax.swing.plaf.InsetsUIResource[top=3,left=3,bottom=3,right=3],selectedTextColor=sun.swing.PrintColorUIResource[r=51,g=51,b=51],selectionColor=javax.swing.plaf.ColorUIResource[r=184,g=207,b=229],kit=javax.swing.JEditorPane$PlainEditorKit@1c6fb4f,typeHandlers=]
        at org.netbeans.modules.editor.NbEditorDocument.createEditor(NbEditorDocument.java:175)
        at org.openide.text.CloneableEditor$DoInitialize.initCustomEditor(CloneableEditor.java:497)
        at org.openide.text.CloneableEditor$DoInitialize.initVisual(CloneableEditor.java:599)
        at org.openide.text.CloneableEditor.getEditorPane(CloneableEditor.java:1067)
        at org.openide.text.CloneableEditorSupport.getOpenedPanes(CloneableEditorSupport.java:1098)
        at org.netbeans.modules.cnd.gizmo.SourceSupportProviderImpl$1.run(SourceSupportProviderImpl.java:206)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:117)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)