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java.lang.reflect.UndeclaredThrowableException: 	at undefined.$Proxy19.actionPerformed(Unknown Source)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:234)	at java.awt.Component.processMouseEvent(Component.java:5488)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3126)	at java.awt.Component.processEvent(Component.java:5253)	at java.awt.Container.processEvent(Container.java:1966)	at java.awt.Component.dispatchEventImpl(Component.java:3955)	at java.awt.Container.dispatchEventImpl(Container.java:2024)