java.lang.NullPointerException
   at org.netbeans.modules.scala.core.ScalaSourceFile.hashCode(ScalaSourceFile.java:123)
   at java.util.concurrent.ConcurrentHashMap.hash(ConcurrentHashMap.java:333)
   at java.util.concurrent.ConcurrentHashMap.remove(ConcurrentHashMap.java:1175)
   at org.netbeans.modules.scala.core.ScalaGlobal.askForSemantic(ScalaGlobal.java:181)
   at org.netbeans.modules.scala.core.element.ScalaElements$ScalaElement.load(ScalaElements.java:245)
   at org.netbeans.modules.scala.core.element.ScalaElements$ScalaElement.getDocComment(ScalaElements.java:160)
   at org.netbeans.modules.scala.editor.ScalaCodeCompletionHandler.document(ScalaCodeCompletionHandler.java:1153)
   at org.netbeans.modules.csl.editor.completion.GsfCompletionDoc.<init>(GsfCompletionDoc.java:110)
   at org.netbeans.modules.csl.editor.completion.GsfCompletionDoc.create(GsfCompletionDoc.java:120)
   at org.netbeans.modules.csl.editor.completion.GsfCompletionProvider$JavaCompletionQuery.resolveDocumentation(GsfCompletionProvider.java:541)
   at org.netbeans.modules.csl.editor.completion.GsfCompletionProvider$JavaCompletionQuery.access$600(GsfCompletionProvider.java:247)
   at org.netbeans.modules.csl.editor.completion.GsfCompletionProvider$JavaCompletionQuery$1.run(GsfCompletionProvider.java:335)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:593)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:155)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:139)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:206)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:203)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:74)
Caused: org.netbeans.modules.parsing.spi.ParseException
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:211)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:106)
   at org.netbeans.modules.csl.editor.completion.GsfCompletionProvider$JavaCompletionQuery.query(GsfCompletionProvider.java:340)
   at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:223)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1432)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2042)