java.lang.AssertionError: Unexpected tag type: ENDTAG
        at org.netbeans.editor.ext.html.parser.SyntaxTree.makeTree(SyntaxTree.java:227)
        at org.netbeans.modules.html.editor.gsf.HtmlParserResult.root(HtmlParserResult.java:93)
        at org.netbeans.modules.html.editor.gsf.HtmlParserResult.<init>(HtmlParserResult.java:82)
        at org.netbeans.modules.html.editor.gsf.HtmlGSFParser.parse(HtmlGSFParser.java:113)
        at org.netbeans.modules.html.editor.gsf.HtmlGSFParser.parse(HtmlGSFParser.java:74)
        at org.netbeans.modules.parsing.impl.SourceCache.getResult(SourceCache.java:198)
        at org.netbeans.modules.parsing.api.ResultIterator.getParserResult(ResultIterator.java:134)
        at org.netbeans.modules.csl.hints.GsfHintsProvider$2.run(GsfHintsProvider.java:295)
        at org.netbeans.modules.csl.hints.GsfHintsProvider$2.run(GsfHintsProvider.java:338)
        at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:129)
        at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:113)
        at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:189)
        at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:99)
        at org.netbeans.modules.csl.hints.GsfHintsProvider.run(GsfHintsProvider.java:291)
        at org.netbeans.modules.csl.hints.GsfHintsProvider.run(GsfHintsProvider.java:96)
        at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:668)
        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)