I get following exception in the library manager.

Annotation: Missing resource from class:
org.openide.util.NbBundle$PBundle
Annotation: Key which was not found: AD_addButton
java.util.MissingResourceException: Can't find
resource for bundle
org.openide.util.NbBundle$PBundle, key AD_addButton
	at
java.util.ResourceBundle.getObject(ResourceBundle.java:314)
	at
java.util.ResourceBundle.getString(ResourceBundle.java:274)
	at
org.netbeans.modules.java.j2seplatform.libraries.J2SEVolumeCustomizer.initComponents(J2SEVolumeCustomizer.java:195)
	at
org.netbeans.modules.java.j2seplatform.libraries.J2SEVolumeCustomizer.<init>(J2SEVolumeCustomizer.java:52)
	at
org.netbeans.modules.java.j2seplatform.libraries.J2SELibraryTypeProvider.getCustomizer(J2SELibraryTypeProvider.java:118)
	at
org.netbeans.modules.project.libraries.ui.LibrariesCustomizer.selectLibrary(LibrariesCustomizer.java:241)
	at
org.netbeans.modules.project.libraries.ui.LibrariesCustomizer.access$000(LibrariesCustomizer.java:58)
	at
org.netbeans.modules.project.libraries.ui.LibrariesCustomizer$1.propertyChange(LibrariesCustomizer.java:147)
	at
java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:252)
	at
org.openide.explorer.ExplorerManager.setSelectedNodes(ExplorerManager.java:219)
	at
org.netbeans.modules.project.libraries.ui.LibrariesCustomizer.addNotify(LibrariesCustomizer.java:124)
	at java.awt.Container.addNotify(Container.java:2049)
	at
javax.swing.JComponent.addNotify(JComponent.java:4288)
	at java.awt.Container.addNotify(Container.java:2049)
	at
javax.swing.JComponent.addNotify(JComponent.java:4288)
	at java.awt.Container.addNotify(Container.java:2049)
	at
javax.swing.JComponent.addNotify(JComponent.java:4288)
	at
javax.swing.JRootPane.addNotify(JRootPane.java:676)
	at java.awt.Container.addNotify(Container.java:2049)
	at java.awt.Window.addNotify(Window.java:418)
	at java.awt.Dialog.addNotify(Dialog.java:389)
	at
org.netbeans.core.windows.services.NbPresenter.addNotify(NbPresenter.java:308)
	at java.awt.Window.pack(Window.java:436)
	at
org.netbeans.core.windows.services.NbPresenter.initialize(NbPresenter.java:165)
	at
org.netbeans.core.windows.services.NbPresenter.<init>(NbPresenter.java:106)
	at
org.netbeans.core.windows.services.NbDialog.<init>(NbDialog.java:36)
	at
org.netbeans.core.windows.services.DialogDisplayerImpl$1.run(DialogDisplayerImpl.java:68)
	at
org.openide.util.Mutex.doEventAccess(Mutex.java:923)
	at org.openide.util.Mutex.readAccess(Mutex.java:158)
	at
org.netbeans.core.windows.services.DialogDisplayerImpl.createDialog(DialogDisplayerImpl.java:51)
	at
org.netbeans.api.project.libraries.LibrariesCustomizer.showCustomizer(LibrariesCustomizer.java:43)
	at
org.netbeans.modules.project.libraries.ui.LibrariesCustomizerAction.performAction(LibrariesCustomizerAction.java:26)
	at
org.openide.util.actions.CallableSystemAction$1.run(CallableSystemAction.java:78)
	at
org.openide.util.actions.CallableSystemAction.doPerformAction(CallableSystemAction.java:116)
	at
org.openide.util.actions.CallableSystemAction.actionPerformed(CallableSystemAction.java:76)
	at
javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1786)
	at
javax.swing.AbstractButton$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)