java.lang.IllegalArgumentException: Duplicate in children list: /Users/marekfukala/NetBeansProjects/PhpProject1/testik2/index.php
Children: [MasterFileObject[/Users/marekfukala/NetBeansProjects/PhpProject1/testik2/index.php@72c166c8:47dae062,valid=true], MasterFileObject[/Users/marekfukala/NetBeansProjects/PhpProject1/testik2/index.php@72c166c8:47dae062,valid=true], MasterFileObject[/Users/marekfukala/NetBeansProjects/PhpProject1/testik2/infolder.html@32f20d32:5d770cee,valid=true], MasterFileObject[/Users/marekfukala/NetBeansProjects/PhpProject1/testik2/infolder.html@32f20d32:5d770cee,valid=true]]
   at org.openide.filesystems.Ordering.getOrder(Ordering.java:98)
   at org.openide.filesystems.FileUtil.getOrder(FileUtil.java:2082)
   at org.openide.loaders.FolderChildren$1R.run(FolderChildren.java:157)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.IllegalArgumentException: Duplicate in children list: /Users/marekfukala/NetBeansProjects/PhpProject1/testik2/index.php
Children: [MasterFileObject[/Users/marekfukala/NetBeansProjects/PhpProject1/testik2/index.php@72c166c8:47dae062,valid=true], MasterFileObject[/Users/marekfukala/NetBeansProjects/PhpProject1/testik2/index.php@72c166c8:47dae062,valid=true], MasterFileObject[/Users/marekfukala/NetBeansProjects/PhpProject1/testik2/infolder.html@32f20d32:5d770cee,valid=true], MasterFileObject[/Users/marekfukala/NetBeansProjects/PhpProject1/testik2/infolder.html@32f20d32:5d770cee,valid=true]]
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:419)
   at org.openide.loaders.FolderChildren.refreshChildren(FolderChildren.java:191)
   at org.openide.loaders.FolderChildren.propertyChange(FolderChildren.java:125)
   at org.openide.util.WeakListenerImpl$PropertyChange.propertyChange(WeakListenerImpl.java:193)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
   at org.openide.loaders.FolderList.fireChildrenChange(FolderList.java:924)
   at org.openide.loaders.FolderList.createBoth(FolderList.java:899)
   at org.openide.loaders.FolderList.access$700(FolderList.java:74)
   at org.openide.loaders.FolderList$2.run(FolderList.java:399)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1415)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1954)