java.lang.NullPointerException
        at org.netbeans.modules.form.JavaCodeGenerator.generateListenerAddCode(JavaCodeGenerator.java:1429)
        at org.netbeans.modules.form.JavaCodeGenerator.generateComponentEvents(JavaCodeGenerator.java:1412)
        at org.netbeans.modules.form.JavaCodeGenerator.addInitCode(JavaCodeGenerator.java:899)
        at org.netbeans.modules.form.JavaCodeGenerator.addInitCode(JavaCodeGenerator.java:907)
        at org.netbeans.modules.form.JavaCodeGenerator.regenerateInitComponents(JavaCodeGenerator.java:734)
        at org.netbeans.modules.form.JavaCodeGenerator.access$900(JavaCodeGenerator.java:46)
        at org.netbeans.modules.form.JavaCodeGenerator$FormListener.formChanged(JavaCodeGenerator.java:2546)
        at org.netbeans.modules.form.FormModel.fireEvents(FormModel.java:821)
        at org.netbeans.modules.form.FormModel.fireFormToBeSaved(FormModel.java:534)
        at org.netbeans.modules.form.FormEditorSupport.saveFormData(FormEditorSupport.java:695)
        at org.netbeans.modules.form.FormEditorSupport.saveDocument(FormEditorSupport.java:200)
        at org.openide.text.EditorSupport$EntryEnv.save(EditorSupport.java:819)
        at org.netbeans.core.windows.actions.ActionUtils.saveDocument(ActionUtils.java:223)
        at org.netbeans.core.windows.actions.ActionUtils.access$100(ActionUtils.java:61)
        at org.netbeans.core.windows.actions.ActionUtils$SaveDocumentAction.actionPerformed(ActionUtils.java:172)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1836)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2154)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
        at javax.swing.AbstractButton.doClick(AbstractButton.java:302)
        at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1000)
        at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1041)
        at java.awt.Component.processMouseEvent(Component.java:5465)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3081)
        at java.awt.Component.processEvent(Component.java:5230)
        at java.awt.Container.processEvent(Container.java:1961)
        at java.awt.Component.dispatchEventImpl(Component.java:3933)
        at java.awt.Container.dispatchEventImpl(Container.java:2019)
        at java.awt.Component.dispatchEvent(Component.java:3781)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4203)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3883)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3813)
        at java.awt.Container.dispatchEventImpl(Container.java:2005)
        at java.awt.Window.dispatchEventImpl(Window.java:1764)
        at java.awt.Component.dispatchEvent(Component.java:3781)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
[catch] at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)