问如何解决android中的致命异常: Timer-11？

EN

if (getZoomLevel() != last_zoom)
 {
 // if computeScroll called before timer counts down we should drop it and start it over again
   zoom_event_delay_timer.cancel();
   zoom_event_delay_timer = new Timer();
   Log.v("last_zoom","last_zoom");
  zoom_event_delay_timer.schedule(new TimerTask()
  {
   @Override
  public void run()
  {
      zoom_change_listener.onZoomChange(_this, getZoomLevel(), last_zoom);
       Log.v("last_zoom","last_zoom"+last_zoom);
       last_zoom = getZoomLevel();
       Log.v("last_zoom","last_zoom");
   }
  }, events_timeout);
}

01-05 12:24:50.791: ERROR/AndroidRuntime(11132): FATAL EXCEPTION: Timer-11
    01-05 12:24:50.791: ERROR/AndroidRuntime(11132): java.util.ConcurrentModificationException
    01-05 12:24:50.791: ERROR/AndroidRuntime(11132):     at java.util.ArrayList$ArrayListIterator.next(ArrayList.java:573)
    01-05 12:24:50.791: ERROR/AndroidRuntime(11132):     at com.bluepal.android.parkable.Prakablescreen.onRegionChange(Prakablescreen.java:1028)
    01-05 12:24:50.791: ERROR/AndroidRuntime(11132):     at com.bluepal.android.parkable.Prakablescreen$14.onPanChange(Prakablescreen.java:467)
    01-05 12:24:50.791: ERROR/AndroidRuntime(11132):     at com.bluepal.android.parkable.EnhancedMapView$2.run(EnhancedMapView.java:126)
    01-05 12:24:50.791: ERROR/AndroidRuntime(11132):     at java.util.Timer$TimerImpl.run(Timer.java:289)