java.lang.NullPointerException
        at org.netbeans.modules.javafx.editor.semantic.MarkOccurrencesHighlighter.processImpl(MarkOccurrencesHighlighter.java:282)
        at org.netbeans.modules.javafx.editor.semantic.MarkOccurrencesHighlighter.run(MarkOccurrencesHighlighter.java:115)
        at org.netbeans.modules.javafx.editor.semantic.MarkOccurrencesHighlighter.run(MarkOccurrencesHighlighter.java:84)
        at org.netbeans.modules.javafx.source.scheduler.CompilationJob.run(CompilationJob.java:200)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
        at java.util.concurrent.FutureTask.run(FutureTask.java:138)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
        at java.lang.Thread.run(Thread.java:619)