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java.lang.NullPointerException: 	at java.awt.Container.addNotify(Container.java:2045)	at javax.swing.JComponent.addNotify(JComponent.java:4283)	at java.awt.Container.addNotify(Container.java:2045)	at javax.swing.JComponent.addNotify(JComponent.java:4283)	at java.awt.Container.addNotify(Container.java:2045)	at javax.swing.JComponent.addNotify(JComponent.java:4283)	at java.awt.Container.addNotify(Container.java:2045)	at javax.swing.JComponent.addNotify(JComponent.java:4283)	at java.awt.Container.addNotify(Container.java:2045)	at javax.swing.JComponent.addNotify(JComponent.java:4283)	at java.awt.Container.addNotify(Container.java:2045)	at javax.swing.JComponent.addNotify(JComponent.java:4283)	at java.awt.Container.addNotify(Container.java:2045)	at javax.swing.JComponent.addNotify(JComponent.java:4283)	at java.awt.Container.addNotify(Container.java:2045)	at javax.swing.JComponent.addNotify(JComponent.java:4283)	at java.awt.Container.addNotify(Container.java:2045)	at javax.swing.JComponent.addNotify(JComponent.java:4283)	at javax.swing.JRootPane.addNotify(JRootPane.java:673)	at java.awt.Container.addNotify(Container.java:2045)	at java.awt.Window.addNotify(Window.java:410)	at java.awt.Frame.addNotify(Frame.java:479)	at java.awt.Window.show(Window.java:448)	at java.awt.Component.show(Component.java:1134)	at java.awt.Component.setVisible(Component.java:1089)