java.lang.NullPointerException: This exception has no message.

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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:178)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:443)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:190)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:144)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:130)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:98)

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