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java.lang.ArrayIndexOutOfBoundsException: -1	at TicTacToeGUI.mouseClicked(TicTacToeGUI.java:303)	at java.awt.Component.processMouseEvent(Component.java:5096)	at java.awt.Component.processEvent(Component.java:4890)	at java.awt.Container.processEvent(Container.java:1566)	at java.awt.Window.processEvent(Window.java:1074)	at java.awt.Component.dispatchEventImpl(Component.java:3598)	at java.awt.Container.dispatchEventImpl(Container.java:1623)	at java.awt.Window.dispatchEventImpl(Window.java:1585)	at java.awt.Component.dispatchEvent(Component.java:3439)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)