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java.lang.NumberFormatException: empty String	at java.lang.FloatingDecimal.readJavaFormatString(FloatingDecimal.89)	at java.lang.Double.parseDouble(Double.java:184)	at StudentRecord$ChoiceListener.actionPerformed(StudentRecordSyste:139)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.j50)	at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(ctButton.java:1504)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButto.java:378)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.ja)	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicBistener.java:216)	at java.awt.Component.processMouseEvent(Component.java:3715)	at java.awt.Component.processEvent(Component.java:3544)	at java.awt.Container.processEvent(Container.java:1164)	at java.awt.Component.dispatchEventImpl(Component.java:2593)	at java.awt.Container.dispatchEventImpl(Container.java:1213)	at java.awt.Component.dispatchEvent(Component.java:2497)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.jav)