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(Container.java:1086)
at java.awt.Container.add(Container.java:410)
at undefined.WeightedAverageProgram.(WeightedAverageProgram.java:61)
at undefined.WeightedAverageProgram.main(WeightedAverageProgram.java:115)

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