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

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java.lang.NullPointerException:
at undefined.GradesGUI_2.init(GradesGUI_2.java:59)
at undefined.GradesGUI_2.(GradesGUI_2.java:40)
at undefined.GradesGUI_2.main(GradesGUI_2.java:20)

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