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Does anyone know what the following errors mean and how to correct? Exception in thread main java.lang.NullPointerException at java.awt.Container.addImpl(Container.java:1093) at java.awt.Container.add(Container.java:417) at Test_Average. (Test_Average.java:111) at

Does anyone know what the following errors mean and how to correct?

Exception in thread "main" java.lang.NullPointerException at java.awt.Container.addImpl(Container.java:1093) at java.awt.Container.add(Container.java:417) at Test_Average.(Test_Average.java:111) at Test_Average.main(Test_Average.java:212)

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