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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)