java.lang.NullPointerException
   at org.netbeans.modules.project.ui.groups.DirectoryGroupEditPanel.updateDirectory(DirectoryGroupEditPanel.java:105)
   at org.netbeans.modules.project.ui.groups.DirectoryGroupEditPanel.applyChanges(DirectoryGroupEditPanel.java:95)
   at org.netbeans.modules.project.ui.groups.GroupEditPanel$1.actionPerformed(GroupEditPanel.java:100)
   at org.netbeans.modules.project.uiapi.CustomizerDialog$OptionListener.storePerformed(CustomizerDialog.java:357)
   at org.netbeans.modules.project.uiapi.CustomizerDialog$OptionListener.access$400(CustomizerDialog.java:253)
   at org.netbeans.modules.project.uiapi.CustomizerDialog$OptionListener$2$1$1.run(CustomizerDialog.java:316)
   at org.openide.filesystems.FileUtil$2.run(FileUtil.java:436)
   at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:127)
   at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:519)
   at org.openide.filesystems.FileUtil.runAtomicAction(FileUtil.java:420)
   at org.openide.filesystems.FileUtil.runAtomicAction(FileUtil.java:440)
   at org.netbeans.modules.project.uiapi.CustomizerDialog$OptionListener$2$1.run(CustomizerDialog.java:309)
   at org.netbeans.modules.openide.util.DefaultMutexImplementation.writeAccess(DefaultMutexImplementation.java:250)
   at org.openide.util.Mutex.writeAccess(Mutex.java:271)
   at org.netbeans.modules.project.uiapi.CustomizerDialog$OptionListener$2.run(CustomizerDialog.java:306)
   at org.openide.util.RequestProcessor$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)