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java.lang.NullPointerException: 	at javax.swing.plaf.basic.BasicOptionPaneUI.getInitialValueIndex(BasicOptionPaneUI.java:835)	at javax.swing.plaf.basic.BasicOptionPaneUI.createButtonArea(BasicOptionPaneUI.java:613)	at javax.swing.plaf.basic.BasicOptionPaneUI.installComponents(BasicOptionPaneUI.java:161)	at javax.swing.plaf.basic.BasicOptionPaneUI.installUI(BasicOptionPaneUI.java:124)	at javax.swing.JComponent.setUI(JComponent.java:673)	at javax.swing.JOptionPane.setUI(JOptionPane.java:1837)	at javax.swing.JOptionPane.updateUI(JOptionPane.java:1859)	at javax.swing.JOptionPane.(JOptionPane.java:1822)	at javax.swing.JOptionPane.showOptionDialog(JOptionPane.java:841)	at format.Format.askUser(Format.java:153)	at format.Format.format(Format.java:85)	at gui.GUI.actionPerformed(GUI.java:531)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)	at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)	at java.awt.Component.processMouseEvent(Component.java:6038)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)	at java.awt.Component.processEvent(Component.java:5803)	at java.awt.Container.processEvent(Container.java:2058)	at java.awt.Component.dispatchEventImpl(Component.java:4410)	at java.awt.Container.dispatchEventImpl(Container.java:2116)	at java.awt.Component.dispatchEvent(Component.java:4240)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)	at java.awt.Container.dispatchEventImpl(Container.java:2102)	at java.awt.Window.dispatchEventImpl(Window.java:2429)	at java.awt.Component.dispatchEvent(Component.java:4240)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)