java.lang.IllegalArgumentException: All children must have the same parent: /home/johnny/Praca/wirtuale.pl/webshop_uti/facebook/cake vs. /home/johnny/Praca/wirtuale.pl/webshop_uti/old_facebook/cake
Children: [MasterFileObject[/home/johnny/Praca/wirtuale.pl/webshop_uti/old_facebook/cake/config@d87255:1938c68,valid=true], MasterFileObject[/home/johnny/Praca/wirtuale.pl/webshop_uti/old_facebook/cake/console@3a53ea:905f2b,valid=true], MasterFileObject[/home/johnny/Praca/wirtuale.pl/webshop_uti/facebook/cake/libs@15b4169:e09ae9,valid=true], MasterFileObject[/home/johnny/Praca/wirtuale.pl/webshop_uti/old_facebook/cake/tests@235e6c:c2bff3,valid=true], MasterFileObject[/home/johnny/Praca/wirtuale.pl/webshop_uti/old_facebook/cake/LICENSE.txt@c2b81:1aea952,valid=true], MasterFileObject[/home/johnny/Praca/wirtuale.pl/webshop_uti/old_facebook/cake/bootstrap.php@fc35aa:1a40da0,valid=true], MasterFileObject[/home/johnny/Praca/wirtuale.pl/webshop_uti/old_facebook/cake/dispatcher.php@2761bf:1a90103,valid=true]]
   at org.openide.filesystems.Ordering.getOrder(Ordering.java:0)
   at org.openide.filesystems.FileUtil.getOrder(FileUtil.java:0)
   at org.openide.loaders.FolderChildren$1R.run(FolderChildren.java:0)
   at org.openide.util.Mutex$1Exec.run(Mutex.java:0)
   at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:0)
   at org.openide.util.Mutex.postRequest(Mutex.java:0)
   at org.openide.util.Mutex.postRequest(Mutex.java:0)
   at org.openide.util.Mutex.postWriteRequest(Mutex.java:0)
   at org.openide.loaders.FolderChildren$1R.run(FolderChildren.java:0)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:0)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:0)