System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
   at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
   at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
   at System.Collections.Generic.List`1.Enumerator.MoveNext()
   at HREngine.Bots.Playfield.triggerACardWillBePlayed(Handcard hc, Boolean own, Minion target, Int32 choice)
   at HREngine.Bots.Playfield.playACard(Handcard hc, Minion target, Int32 position, Int32 choice, Int32 penality)
   at HREngine.Bots.Playfield.doAction(Action aa)
   at HREngine.Bots.MiniSimulatorNextTurn.doallmoves(Playfield playf, Boolean isLethalCheck, Boolean print)
   at HREngine.Bots.EnemyTurnSimulator.simulateEnemysTurn(Playfield rootfield, Boolean simulateTwoTurns, Boolean playaround, Boolean print, Int32 pprob, Int32 pprob2)
   at HREngine.Bots.MiniSimulator.dirtyWorkthread(Object to)
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart(Object obj)