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This exception has no message.
java.util.ConcurrentModificationException: 	at java.util.ArrayDeque$	at mage.players.Library.(	at mage.players.Library.copy(	at mage.players.PlayerImpl.(	at mage.player.human.HumanPlayer.(	at mage.player.human.HumanPlayer.copy(	at mage.player.human.HumanPlayer.copy(	at mage.players.Players.(	at mage.players.Players.copy(	at	at	at	at	at	at mage.players.PlayerImpl.playAbility(	at mage.players.PlayerImpl.activateAbility(	at mage.player.human.HumanPlayer.activateAbility(	at mage.player.human.HumanPlayer.activateAbility(	at mage.player.human.HumanPlayer.priority(	at	at	at	at	at	at	at	at	at	at	at java.util.concurrent.ThreadPoolExecutor.runWorker(	at java.util.concurrent.ThreadPoolExecutor$	at