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:1019)
at java.awt.Container.add(Container.java:351)
at undefined.MainPage.(MainPage.java:36)
at undefined.startApp.(startApp.java:37)
at undefined.startApp.main(startApp.java:70)

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