Using default project settings...
javax.swing.text.BadLocationException: Wrong position -1. Document length is 115

        at com.netbeans.editor.DocMarksOp.insertMark(DocMarksOp.java:176)
        at com.netbeans.editor.StyledGuardedDocument$LineElementRoot.getElement(
StyledGuardedDocument.java:462)
        at org.openide.text.NbDocument.findLineOffset(NbDocument.java:118)
        at org.openide.text.PositionRef$Manager$LineKind.toMemory(PositionRef.ja
va:479)
        at org.openide.text.PositionRef$Manager.documentOpened(PositionRef.java:
210)
        at org.openide.text.EditorSupport$3.run(EditorSupport.java:306)
        at org.openide.util.Task.run(Task.java:123)
        at org.openide.text.EditorSupport$4.run(EditorSupport.java:319)
        at org.openide.util.Task.run(Task.java:123)
        at java.lang.Thread.run(Thread.java:479)
Exception occurred in request processor:
java.lang.NullPointerException
        at org.openide.text.NbDocument.findLineOffset(NbDocument.java:118)
        at org.openide.text.PositionRef$Manager$LineKind.toMemory(PositionRef.ja
va:479)
        at org.openide.text.PositionRef$Manager.documentOpened(PositionRef.java:
210)
        at org.openide.text.EditorSupport$3.run(EditorSupport.java:306)
        at org.openide.util.Task.run(Task.java:123)
        at org.openide.text.EditorSupport$4.run(EditorSupport.java:319)
        at org.openide.util.Task.run(Task.java:123)
        at java.lang.Thread.run(Thread.java:479)