java.lang.ClassCastException: javax.swing.JFrame cannot be cast to javax.swing.JPanel

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    Root Cause Analysis

    1. java.lang.ClassCastException

      javax.swing.JFrame cannot be cast to javax.swing.JPanel

      at Checkers.mouseClicked()
    2. Unknown
      Checkers.mouseClicked
      1. Checkers.mouseClicked(Checkers.java:63)
      1 frame
    3. Java RT
      EventQueue.dispatchEvent
      1. java.awt.Component.processMouseEvent(Component.java:6538)
      2. java.awt.Component.processEvent(Component.java:6300)
      3. java.awt.Container.processEvent(Container.java:2236)
      4. java.awt.Window.processEvent(Window.java:2029)
      5. java.awt.Component.dispatchEventImpl(Component.java:4891)
      6. java.awt.Container.dispatchEventImpl(Container.java:2294)
      7. java.awt.Window.dispatchEventImpl(Window.java:2750)
      8. java.awt.Component.dispatchEvent(Component.java:4713)
      9. java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
      10. java.awt.EventQueue.access$500(EventQueue.java:97)
      11. java.awt.EventQueue$3.run(EventQueue.java:709)
      12. java.awt.EventQueue$3.run(EventQueue.java:703)
      13. java.security.AccessController.doPrivileged(Native Method)
      14. java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
      15. java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
      16. java.awt.EventQueue$4.run(EventQueue.java:731)
      17. java.awt.EventQueue$4.run(EventQueue.java:729)
      18. java.security.AccessController.doPrivileged(Native Method)
      19. java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
      20. java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
      20 frames
    4. org.GNOME.Accessibility
      AtkWrapper$5.dispatchEvent
      1. org.GNOME.Accessibility.AtkWrapper$5.dispatchEvent(AtkWrapper.java:697)
      1 frame
    5. Java RT
      EventDispatchThread.run
      1. java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
      2. java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
      3. java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
      4. java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
      5. java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
      6. java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
      6 frames