java.lang.NullPointerException
        at org.netbeans.modules.form.layoutdesign.LayoutPersistenceManager.saveLayout(LayoutPersistenceManager.java:155)
        at org.netbeans.modules.form.layoutdesign.LayoutPersistenceManager.saveContainer(LayoutPersistenceManager.java:135)
        at org.netbeans.modules.form.layoutdesign.LayoutModel.saveContainerLayout(LayoutModel.java:1062)
        at org.netbeans.modules.form.GandalfPersistenceManager.saveLayout(GandalfPersistenceManager.java:3304)
        at org.netbeans.modules.form.GandalfPersistenceManager.saveContainer(GandalfPersistenceManager.java:3258)
        at org.netbeans.modules.form.GandalfPersistenceManager.saveAnyComponent(GandalfPersistenceManager.java:3231)
        at org.netbeans.modules.form.GandalfPersistenceManager.saveContainer(GandalfPersistenceManager.java:3275)
        at org.netbeans.modules.form.GandalfPersistenceManager.saveAnyComponent(GandalfPersistenceManager.java:3231)
        at org.netbeans.modules.form.GandalfPersistenceManager.saveForm(GandalfPersistenceManager.java:3126)
        at org.netbeans.modules.form.FormEditor.saveFormData(FormEditor.java:412)
        at org.netbeans.modules.form.FormEditorSupport.saveDocument(FormEditorSupport.java:323)
        at org.netbeans.modules.form.FormEditorSupport$9.doSave(FormEditorSupport.java:1403)
        at org.netbeans.modules.form.FormEditorSupport$9.save(FormEditorSupport.java:1384)
        at org.openide.actions.SaveAction.performAction(SaveAction.java:112)
        at org.openide.actions.SaveAction.performAction(SaveAction.java:92)
        at org.openide.actions.SaveAction$Delegate.actionPerformed(SaveAction.java:229)
        at org.openide.awt.ContextAction$Performer.actionPerformed(ContextAction.java:226)
        at org.openide.awt.ContextManager.actionPerformed(ContextManager.java:239)
        at org.openide.awt.ContextAction.actionPerformed(ContextAction.java:106)
        at org.netbeans.modules.openide.util.ActionsBridge$ActionRunnable$1.run(ActionsBridge.java:108)
        at org.netbeans.modules.openide.util.ActionsBridge.implPerformAction(ActionsBridge.java:83)
        at org.netbeans.modules.openide.util.ActionsBridge.doPerformAction(ActionsBridge.java:67)
        at org.openide.awt.GeneralAction$DelegateAction.actionPerformed(GeneralAction.java:218)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2015)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2338)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
        at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:253)
        at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:290)
        at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
        at java.awt.Component.processMouseEvent(Component.java:6260)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3309)
        at java.awt.Component.processEvent(Component.java:6025)
        at java.awt.Container.processEvent(Container.java:2083)
        at java.awt.Component.dispatchEventImpl(Component.java:4620)
        at java.awt.Container.dispatchEventImpl(Container.java:2141)
        at java.awt.Component.dispatchEvent(Component.java:4446)
        at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4663)
        at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4326)
        at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4256)
        at java.awt.Container.dispatchEventImpl(Container.java:2127)
        at java.awt.Window.dispatchEventImpl(Window.java:2612)
        at java.awt.Component.dispatchEvent(Component.java:4446)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:605)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:117)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:286)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:201)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:191)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:186)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:178)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:139)