java.lang.ClassCastException: org.netbeans.modules.java.source.parsing.JavacParserResult cannot be cast to org.netbeans.modules.csl.spi.ParserResult
        at org.netbeans.modules.csl.editor.completion.GsfCompletionProvider$JavaCompletionQuery$1.run(GsfCompletionProvider.java:314)
        at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:123)
        at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:105)
Caused: org.netbeans.modules.parsing.spi.ParseException
        at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:189)
        at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:96)
        at org.netbeans.modules.csl.editor.completion.GsfCompletionProvider$JavaCompletionQuery.query(GsfCompletionProvider.java:309)
        at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:218)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:573)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1005)