java.lang.ClassCastException: org.netbeans.modules.css.gsf.api.CssParserResult cannot be cast to org.netbeans.modules.html.editor.gsf.HtmlParserResult
        at org.netbeans.modules.html.editor.gsf.HtmlSemanticAnalyzer.run(HtmlSemanticAnalyzer.java:89)
        at org.netbeans.modules.csl.editor.semantic.SemanticHighlighter.process(SemanticHighlighter.java:315)
        at org.netbeans.modules.csl.editor.semantic.SemanticHighlighter.access$000(SemanticHighlighter.java:80)
        at org.netbeans.modules.csl.editor.semantic.SemanticHighlighter$1.run(SemanticHighlighter.java:148)
        at org.netbeans.modules.csl.editor.semantic.SemanticHighlighter$1.run(SemanticHighlighter.java:157)
        at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:131)
        at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:115)
        at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:188)
        at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:101)
        at org.netbeans.modules.csl.editor.semantic.SemanticHighlighter.run(SemanticHighlighter.java:129)
        at org.netbeans.modules.csl.editor.semantic.SemanticHighlighter.run(SemanticHighlighter.java:80)
        at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:681)
        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$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)