Java applet AWT-EventQueue-1 Exception

I wrote a simple implementation of the Game of life with java applets. Here's is the source code for the Applet and the Model.

When I click the button to get the next iteration these Exceptions get thrown.

Z:\GameOfLife>appletviewer driver.html

Exception in thread "AWT-EventQueue-1" java.lang.ArrayIndexOutOfBoundsException:

 65

        at GameOfLifeApplet.mouseClicked(GameOfLifeApplet.java:63)

        at java.awt.Component.processMouseEvent(Component.java:6219)

        at java.awt.Component.processEvent(Component.java:5981)

        at java.awt.Container.processEvent(Container.java:2041)

        at java.awt.Component.dispatchEventImpl(Component.java:4583)

        at java.awt.Container.dispatchEventImpl(Container.java:2099)

        at java.awt.Component.dispatchEvent(Component.java:4413)

        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)

        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThre

ad.java:269)

        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.

java:184)

        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre

ad.java:174)

        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)



        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)



        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)