Unable to add component palette in jdeveloper

Hi,
Im unable to add component palette in jdeveloper, it is giving exception and the stack trace is here below, pls let me know the solution.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
java.lang.NullPointerException
     at oracle.ideimpl.palette.PaletteImpl.populate(PaletteImpl.java:240)
     at oracle.ideimpl.palette.PaletteWindowImpl.checkIfPopulated(PaletteWindowImpl.java:323)
     at oracle.ideimpl.palette.PaletteWindowImpl.show(PaletteWindowImpl.java:364)
     at oracle.ideimpl.palette.PaletteManagerImpl.handleEvent(PaletteManagerImpl.java:174)
     at oracle.ide.IdeAction$1.run(IdeAction.java:579)
     at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:154)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:337)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:131)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:98)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)

Try copying the palette.xml file from jdev\multi\system to your system directory( jdev\system(9....). Also, what system are you using?

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