SampleEmulationTesting версия 4.0.8

в StockSharp.BusinessEntities.Unit.CreateResult(Unit u1, Unit u2, Func`3 operation, Func`3 percentOperation)
   в StockSharp.BusinessEntities.Unit.op_Subtraction(Unit u1, Unit u2)
   в StockSharp.Algo.TraderHelper.GetMarketPrice(Security security, OrderDirections direction, Unit priceDelta, MarketPriceTypes priceType)
   в SampleEmulationTesting.SmaStrategy.OnProcess() в E:\Market\S#\4.0.8\Samples\Testing\SampleEmulationTesting\SmaStrategy.cs:строка 93

// создаем заявку
var order = this.CreateOrder(direction, base.Security.GetMarketPrice(direction), base.Volume, new Unit());