java.nio.channels.ClosedChannelException
   at sun.nio.ch.FileChannelImpl.ensureOpen(FileChannelImpl.java:109)
   at sun.nio.ch.FileChannelImpl.read(FileChannelImpl.java:688)
Caused: java.io.IOException: null: NIOFSIndexInput(path="/home/mido/.cache/netbeans/8.1/index/s1/php/24/1/_0.cfs")
   at org.apache.lucene.store.NIOFSDirectory$NIOFSIndexInput.readInternal(NIOFSDirectory.java:180)
   at org.apache.lucene.store.BufferedIndexInput.readBytes(BufferedIndexInput.java:155)
   at org.apache.lucene.index.CompoundFileReader$CSIndexInput.readInternal(CompoundFileReader.java:274)
   at org.apache.lucene.store.BufferedIndexInput.refill(BufferedIndexInput.java:229)
   at org.apache.lucene.store.BufferedIndexInput.readByte(BufferedIndexInput.java:39)
   at org.apache.lucene.store.DataInput.readVInt(DataInput.java:105)
   at org.apache.lucene.store.BufferedIndexInput.readVInt(BufferedIndexInput.java:197)
   at org.apache.lucene.index.TermBuffer.read(TermBuffer.java:64)
   at org.apache.lucene.index.SegmentTermEnum.next(SegmentTermEnum.java:133)
   at org.apache.lucene.index.SegmentTermEnum.scanTo(SegmentTermEnum.java:174)
   at org.apache.lucene.index.TermInfosReader.get(TermInfosReader.java:236)
   at org.apache.lucene.index.TermInfosReader.terms(TermInfosReader.java:304)
   at org.apache.lucene.index.SegmentReader.terms(SegmentReader.java:464)
   at org.apache.lucene.search.PrefixTermEnum.<init>(PrefixTermEnum.java:41)
   at org.apache.lucene.search.PrefixQuery.getEnum(PrefixQuery.java:45)
   at org.apache.lucene.search.MultiTermQueryWrapperFilter.getDocIdSet(MultiTermQueryWrapperFilter.java:107)
   at org.apache.lucene.search.ConstantScoreQuery$ConstantWeight.scorer(ConstantScoreQuery.java:139)
   at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:577)
   at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:383)
   at org.netbeans.modules.parsing.lucene.LuceneIndex.query(LuceneIndex.java:187)
   at org.netbeans.modules.parsing.lucene.DocumentIndexImpl.query(DocumentIndexImpl.java:284)
   at org.netbeans.modules.parsing.impl.indexing.lucene.LayeredDocumentIndex.query(LayeredDocumentIndex.java:205)
   at org.netbeans.modules.parsing.spi.indexing.support.QuerySupport$Query$1.call(QuerySupport.java:652)
   at org.netbeans.modules.parsing.spi.indexing.support.QuerySupport$Query$1.call(QuerySupport.java:613)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:141)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:88)
   at org.netbeans.modules.parsing.spi.indexing.support.QuerySupport$Query.execute(QuerySupport.java:613)
   at org.netbeans.modules.parsing.spi.indexing.support.QuerySupport.query(QuerySupport.java:365)
   at org.netbeans.modules.php.editor.elements.IndexQueryImpl.search(IndexQueryImpl.java:1591)
   at org.netbeans.modules.php.editor.elements.IndexQueryImpl.results(IndexQueryImpl.java:1629)
   at org.netbeans.modules.php.editor.elements.IndexQueryImpl.getDeclaredMethods(IndexQueryImpl.java:586)
   at org.netbeans.modules.php.editor.elements.IndexQueryImpl.getAllMethods(IndexQueryImpl.java:1126)
   at org.netbeans.modules.php.editor.model.impl.OccurenceBuilder.buildMethodInvocations(OccurenceBuilder.java:1036)
   at org.netbeans.modules.php.editor.model.impl.OccurenceBuilder.buildMethods(OccurenceBuilder.java:904)
   at org.netbeans.modules.php.editor.model.impl.OccurenceBuilder.build(OccurenceBuilder.java:719)
   at org.netbeans.modules.php.editor.model.impl.OccurenceBuilder.build(OccurenceBuilder.java:1959)
   at org.netbeans.modules.php.editor.model.impl.ModelVisitor.getOccurence(ModelVisitor.java:1287)
   at org.netbeans.modules.php.editor.model.OccurencesSupport.getOccurence(OccurencesSupport.java:66)
   at org.netbeans.modules.refactoring.php.findusages.WhereUsedSupport.findOccurence(WhereUsedSupport.java:207)
   at org.netbeans.modules.refactoring.php.findusages.WhereUsedSupport.getInstance(WhereUsedSupport.java:214)
   at org.netbeans.modules.refactoring.php.RefactoringActionsProvider$1.createRefactoringUI(RefactoringActionsProvider.java:101)
   at org.netbeans.modules.refactoring.php.RefactoringTask$TextComponentTask.run(RefactoringTask.java:191)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:609)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:153)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:137)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:204)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:201)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:141)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:88)
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:201)
   at org.netbeans.modules.parsing.impl.RunWhenScanFinishedSupport.runWhenScanFinished(RunWhenScanFinishedSupport.java:146)
   at org.netbeans.modules.parsing.api.ParserManager.parseWhenScanFinished(ParserManager.java:130)
   at org.netbeans.modules.refactoring.php.RefactoringTask$ParsingTask.run(RefactoringTask.java:111)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
   at java.util.concurrent.FutureTask.run(FutureTask.java:266)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)