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

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java.lang.NullPointerException:
at java.awt.Container.addNotify(Container.java:2049)
at javax.swing.JComponent.addNotify(JComponent.java:4291)
at java.awt.Container.addNotify(Container.java:2049)
at javax.swing.JComponent.addNotify(JComponent.java:4291)
at java.awt.Container.addNotify(Container.java:2049)
at javax.swing.JComponent.addNotify(JComponent.java:4291)
at javax.swing.JRootPane.addNotify(JRootPane.java:676)
at java.awt.Container.addNotify(Container.java:2049)
at java.awt.Window.addNotify(Window.java:418)
at java.awt.Dialog.addNotify(Dialog.java:389)
at java.awt.Dialog.conditionalShow(Dialog.java:454)
at java.awt.Dialog.show(Dialog.java:524)
at java.awt.Component.show(Component.java:1133)
at java.awt.Component.setVisible(Component.java:1088)
at workbench.MainWindow.actionPerformed(MainWindow.java:188)

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