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

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This exception has no message.
java.lang.NullPointerException:
at java.awt.Container.addImpl(Unknown Source)
at java.awt.Container.add(Unknown Source)
at undefined.Q_3.createBackgroundPanel(Q_3.java:33)
at undefined.Q_3.createGUI(Q_3.java:24)
at undefined.Q_3.(Q_3.java:15)
at undefined.Q_3$2.run(Q_3.java:72)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

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