java.util.ConcurrentModificationException: This exception has no message.

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java.util.ConcurrentModificationException: 	at java.util.AbstractList$Itr.checkForComodification(Unknown Source)	at java.util.AbstractList$Itr.next(Unknown Source)	at robocode.peer.robot.EventManager.getAllEvents(Unknown Source)	at robocode.AdvancedRobot.getAllEvents(Unknown Source)	at procyon.EventManager$1.test(EventManager.java:50)	at robocode.peer.robot.EventManager.processEvents(Unknown Source)	at robocode.peer.RobotPeer.tick(Unknown Source)	at robocode.AdvancedRobot.execute(Unknown Source)	at procyon.RadarRobot.run(RadarRobot.java:94)	at robocode.peer.RobotPeer.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)