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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)