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via Oracle Community by 807587, 1 year ago
This exception has no message.
java.lang.NullPointerException: 	at Start.actionPerformed(Start.java:40)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1786)	at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1839)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)	at javax.swing.JToggleButton$ToggleButtonModel.setPressed(JToggleButton.java:273)	at javax.swing.AbstractButton.doClick(AbstractButton.java:289)	at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1113)