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

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java.util.ConcurrentModificationException:
at java.util.ArrayDeque$DeqIterator.next(ArrayDeque.java:643)
at mage.players.Library.(Library.java:66)
at mage.players.Library.copy(Library.java:162)
at mage.players.PlayerImpl.(PlayerImpl.java:272)
at mage.player.human.HumanPlayer.(HumanPlayer.java:136)
at mage.player.human.HumanPlayer.copy(HumanPlayer.java:1453)
at mage.player.human.HumanPlayer.copy(HumanPlayer.java:103)
at mage.players.Players.(Players.java:45)
at mage.players.Players.copy(Players.java:60)
at mage.game.GameState.(GameState.java:154)
at mage.game.GameState.copy(GameState.java:241)
at mage.game.GameStates.save(GameStates.java:54)
at mage.game.GameImpl.saveState(GameImpl.java:577)
at mage.game.GameImpl.bookmarkState(GameImpl.java:660)
at mage.players.PlayerImpl.playAbility(PlayerImpl.java:1115)
at mage.players.PlayerImpl.activateAbility(PlayerImpl.java:1199)
at mage.player.human.HumanPlayer.activateAbility(HumanPlayer.java:1246)
at mage.player.human.HumanPlayer.activateAbility(HumanPlayer.java:1256)
at mage.player.human.HumanPlayer.priority(HumanPlayer.java:716)
at mage.game.GameImpl.playPriority(GameImpl.java:1298)
at mage.game.turn.Step.priority(Step.java:87)
at mage.game.turn.Phase.playStep(Phase.java:210)
at mage.game.turn.Phase.play(Phase.java:115)
at mage.game.turn.Turn.play(Turn.java:152)
at mage.game.GameImpl.playTurn(GameImpl.java:852)
at mage.game.GameImpl.play(GameImpl.java:766)
at mage.game.GameImpl.start(GameImpl.java:733)
at mage.server.game.GameWorker.call(GameWorker.java:60)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

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