org.netbeans.modules.parsing.lucene.support.Index$IndexClosedException
   at org.netbeans.modules.parsing.lucene.LuceneIndex$DirCache.checkPreconditions(LuceneIndex.java:981)
   at org.netbeans.modules.parsing.lucene.LuceneIndex$DirCache.getReader(LuceneIndex.java:863)
   at org.netbeans.modules.parsing.lucene.LuceneIndex$DirCache.acquireReader(LuceneIndex.java:845)
   at org.netbeans.modules.parsing.lucene.LuceneIndex.query(LuceneIndex.java:162)
   at org.netbeans.modules.parsing.lucene.DocumentIndexImpl.query(DocumentIndexImpl.java:252)
   at org.netbeans.modules.parsing.impl.indexing.lucene.LayeredDocumentIndex.query(LayeredDocumentIndex.java:127)
   at org.netbeans.modules.parsing.spi.indexing.support.QuerySupport$1.call(QuerySupport.java:286)
   at org.netbeans.modules.parsing.spi.indexing.support.QuerySupport$1.call(QuerySupport.java:252)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:168)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:72)
   at org.netbeans.modules.parsing.spi.indexing.support.QuerySupport.query(QuerySupport.java:252)
   at org.netbeans.modules.php.editor.elements.IndexQueryImpl.search(IndexQueryImpl.java:1504)
   at org.netbeans.modules.php.editor.elements.IndexQueryImpl.results(IndexQueryImpl.java:1542)
   at org.netbeans.modules.php.editor.elements.IndexQueryImpl.getDeclaredMethods(IndexQueryImpl.java:570)
   at org.netbeans.modules.php.editor.elements.IndexQueryImpl.getAllMethods(IndexQueryImpl.java:1076)
   at org.netbeans.modules.php.editor.elements.IndexQueryImpl.getAccessibleMethods(IndexQueryImpl.java:940)
   at org.netbeans.modules.php.editor.verification.ImplementAbstractMethodsHint.checkHints(ImplementAbstractMethodsHint.java:129)
   at org.netbeans.modules.php.editor.verification.ImplementAbstractMethodsHint.computeHintsImpl(ImplementAbstractMethodsHint.java:108)
   at org.netbeans.modules.php.editor.verification.PHPHintsProvider.computeHints(PHPHintsProvider.java:97)
   at org.netbeans.modules.csl.hints.infrastructure.HintsTask$1.run(HintsTask.java:126)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:583)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:150)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:134)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:200)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:197)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:168)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:72)
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:197)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:102)
   at org.netbeans.modules.csl.hints.infrastructure.HintsTask.run(HintsTask.java:88)
   at org.netbeans.modules.csl.hints.infrastructure.HintsTask.run(HintsTask.java:74)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:558)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:734)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
   at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
   at java.util.concurrent.FutureTask.run(FutureTask.java:166)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
   at java.lang.Thread.run(Thread.java:722)