java.lang.IllegalArgumentException: Duplicate in children list: /Users/tleitner/NetBeansProjects/goodbye-europe.net/wp-content/plugins/wp-maintenance-mode/js/jquery.countdown-fr.js
Children: [MasterFileObject[/Users/tleitner/NetBeansProjects/goodbye-europe.net/wp-content/plugins/wp-maintenance-mode/js/de_DE.datetimepicker.js@563afc0c:79ac3b87,valid=true], MasterFileObject[/Users/tleitner/NetBeansProjects/goodbye-europe.net/wp-content/plugins/wp-maintenance-mode/js/jquery.countdown-ar.js@7d869bc7:745ad2de,valid=true], MasterFileObject[/Users/tleitner/NetBeansProjects/goodbye-europe.net/wp-content/plugins/wp-maintenance-mode/js/jquery.countdown-cs.js@99f0a4b:caafeff,valid=true], MasterFileObject[/Users/tleitner/NetBeansProjects/goodbye-europe.net/wp-content/plugins/wp-maintenance-mode/js/jquery.countdown-da.js@44f09a7c:38b930e4,valid=true], MasterFileObject[/Users/tleitner/NetBeansProjects/goodbye-europe.net/wp-content/plugins/wp-maintenance-mode/js/jquery.countdown-de.js@66e136be:4cd452db,valid=true], MasterFi
   at org.openide.filesystems.Ordering.getOrder(Ordering.java:101)
   at org.openide.filesystems.FileUtil.getOrder(FileUtil.java:2162)
   at org.openide.loaders.FolderList.carefullySort(FolderList.java:644)
   at org.openide.loaders.FolderList.createBoth(FolderList.java:889)
   at org.openide.loaders.FolderList.access$700(FolderList.java:77)
   at org.openide.loaders.FolderList$2.run(FolderList.java:402)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.IllegalArgumentException: Duplicate in children list: /Users/tleitner/NetBeansProjects/goodbye-europe.net/wp-content/plugins/wp-maintenance-mode/js/jquery.countdown-fr.js
Children: [MasterFileObject[/Users/tleitner/NetBeansProjects/goodbye-europe.net/wp-content/plugins/wp-maintenance-mode/js/de_DE.datetimepicker.js@563afc0c:79ac3b87,valid=true], MasterFileObject[/Users/tleitner/NetBeansProjects/goodbye-europe.net/wp-content/plugins/wp-maintenance-mode/js/jquery.countdown-ar.js@7d869bc7:745ad2de,valid=true], MasterFileObject[/Users/tleitner/NetBeansProjects/goodbye-europe.net/wp-content/plugins/wp-maintenance-mode/js/jquery.countdown-cs.js@99f0a4b:caafeff,valid=true], MasterFileObject[/Users/tleitner/NetBeansProjects/goodbye-europe.net/wp-content/plugins/wp-maintenance-mode/js/jquery.countdown-da.js@44f09a7c:38b930e4,valid=true], MasterFileObject[/Users/tleitner/NetBeansProjects/goodbye-europe.net/wp-content/plugins/wp-maintenance-mode/j
   at org.openide.util.RequestProcessor$Task.schedule(RequestProcessor.java:1465)
   at org.openide.loaders.FolderList.refresh(FolderList.java:407)
   at org.openide.loaders.FolderList.fileRenamed(FolderList.java:543)
   at sun.reflect.GeneratedMethodAccessor37.invoke(GeneratedMethodAccessor37.java:0)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:459)
   at $Proxy1.fileRenamed(.java:0)
   at org.openide.filesystems.FCLSupport$DispatchEventWrapper.dispatchEventImpl(FCLSupport.java:151)
   at org.openide.filesystems.FCLSupport$DispatchEventWrapper.dispatchEvent(FCLSupport.java:128)
   at org.openide.filesystems.FCLSupport.dispatchEvent(FCLSupport.java:105)
   at org.openide.filesystems.FileObject$ED.dispatch(FileObject.java:1146)
   at org.openide.filesystems.EventControl.invokeDispatchers(EventControl.java:208)
   at org.openide.filesystems.EventControl.exitAtomicAction(EventControl.java:182)
   at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:127)
   at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:566)
   at org.openide.filesystems.FileUtil.runAtomicAction(FileUtil.java:572)
   at org.netbeans.modules.php.project.connections.RemoteClient.download(RemoteClient.java:580)
   at org.netbeans.modules.php.project.ui.actions.DownloadCommand.download(DownloadCommand.java:157)
   at org.netbeans.modules.php.project.ui.actions.DownloadCommand.invokeActionImpl(DownloadCommand.java:109)
   at org.netbeans.modules.php.project.ui.actions.DownloadCommand$1.run(DownloadCommand.java:87)
   at org.netbeans.modules.php.project.ui.actions.RemoteCommand$1.run(RemoteCommand.java:92)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1424)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1968)