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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)