java.lang.NullPointerException: This exception has no message.

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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)

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