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java.lang.NullPointerException: 	at java.awt.Container.addImpl(Unknown Source)	at java.awt.Container.add(Unknown Source)	at javax.swing.JDialog.addImpl(Unknown Source)	at java.awt.Container.add(Unknown Source)	at TestDialog.(TryDialog.java:28)	at TryDialog.(TryDialog.java:68)	at TryDialog.main(TryDialog.java:91)