org.openide.filesystems.FileStateInvalidException
	at org.openide.filesystems.AbstractFileObject$Invalid.getFileSystem(AbstractFileObject.java:866)
	at org.openide.filesystems.MultiFileObject.writable(MultiFileObject.java:250)
	at org.openide.filesystems.MultiFileObject.getOutputStream(MultiFileObject.java:488)
	at org.netbeans.core.windows.persistence.GroupParser$PropertyHandler.writeData(GroupParser.java:694)
	at org.netbeans.core.windows.persistence.GroupParser.writeProperties(GroupParser.java:256)
	at org.netbeans.core.windows.persistence.GroupParser.save(GroupParser.java:101)
	at org.netbeans.core.windows.persistence.WindowManagerParser.writeGroups(WindowManagerParser.java:691)
	at org.netbeans.core.windows.persistence.WindowManagerParser.save(WindowManagerParser.java:118)
	at org.netbeans.core.windows.persistence.PersistenceManager.saveWindowSystem(PersistenceManager.java:1180)
	at org.netbeans.core.windows.PersistenceHandler.save(PersistenceHandler.java:263)
	at org.netbeans.core.windows.PersistenceHandler.saveProjectWinsysData(PersistenceHandler.java:253)
	at org.netbeans.core.windows.PersistenceHandler.saveProjectData(PersistenceHandler.java:874)
	at org.netbeans.core.windows.WindowSystemImpl.saveProjectData(WindowSystemImpl.java:75)
	at org.netbeans.modules.projects.PSupport$1.run(PSupport.java:142)
	at org.openide.util.Mutex.doEvent(Mutex.java:900)
	at org.openide.util.Mutex.readAccess(Mutex.java:226)
	at org.netbeans.modules.projects.PSupport.switchToProject(PSupport.java:137)
	at org.netbeans.modules.projects.PSupport.openProject(PSupport.java:133)
	at org.netbeans.modules.projects.ProjectManagerPanel.openButtonActionPerformed(ProjectManagerPanel.java:390)
	at org.netbeans.modules.projects.ProjectManagerPanel.access$200(ProjectManagerPanel.java:48)
	at org.netbeans.modules.projects.ProjectManagerPanel$3.actionPerformed(ProjectManagerPanel.java:184)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1786)
	at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1839)
	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:245)
	at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:231)
	at java.awt.Component.processMouseEvent(Component.java:5100)
	at java.awt.Component.processEvent(Component.java:4897)
	at java.awt.Container.processEvent(Container.java:1569)
	at java.awt.Component.dispatchEventImpl(Component.java:3615)
	at java.awt.Container.dispatchEventImpl(Container.java:1627)
	at java.awt.Component.dispatchEvent(Component.java:3477)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3198)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128)
	at java.awt.Container.dispatchEventImpl(Container.java:1613)
	at java.awt.Window.dispatchEventImpl(Window.java:1606)
	at java.awt.Component.dispatchEvent(Component.java:3477)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:141)
	at java.awt.Dialog$1.run(Dialog.java:540)
	at java.awt.Dialog.show(Dialog.java:561)
	at org.netbeans.core.windows.services.NbPresenter.superShow(NbPresenter.java:721)
	at org.netbeans.core.windows.services.NbPresenter.doShow(NbPresenter.java:764)
	at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:752)
	at org.openide.util.Mutex.doEventAccess(Mutex.java:920)
	at org.openide.util.Mutex.readAccess(Mutex.java:157)
	at org.netbeans.core.windows.services.NbPresenter.show(NbPresenter.java:737)
	at org.netbeans.modules.projects.ProjectManagerAction.performAction(ProjectManagerAction.java:64)
	at org.openide.util.actions.CallableSystemAction$1.run(CallableSystemAction.java:78)
	at org.openide.util.actions.CallableSystemAction.doPerformAction(CallableSystemAction.java:135)
	at org.openide.util.actions.CallableSystemAction.actionPerformed(CallableSystemAction.java:76)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1786)
	at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1839)
	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
	at javax.swing.AbstractButton.doClick(AbstractButton.java:289)
	at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1113)
	at javax.swing.plaf.basic.BasicMenuItemUI$MouseInputHandler.mouseReleased(BasicMenuItemUI.java:943)
	at java.awt.Component.processMouseEvent(Component.java:5100)
	at java.awt.Component.processEvent(Component.java:4897)
	at java.awt.Container.processEvent(Container.java:1569)
	at java.awt.Component.dispatchEventImpl(Component.java:3615)
	at java.awt.Container.dispatchEventImpl(Container.java:1627)
	at java.awt.Component.dispatchEvent(Component.java:3477)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3198)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128)
	at java.awt.Container.dispatchEventImpl(Container.java:1613)
	at java.awt.Window.dispatchEventImpl(Window.java:1606)
	at java.awt.Component.dispatchEvent(Component.java:3477)
[catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)