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This exception has no message.
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)