策略中涉及期权希腊字母计算交易是中断是为什么？

VarsGlobal Integer id(0);Global Bool subFlag(False);EventsOnReady(){if(!subFlag){id = SubscribeBar(RelativeSymbol, "1d", BeginDateTime);subFlag = True;}}OnBar(ArrayRef indexs){Buy(1, Open);Sell(1, Open);Numeric volty = Volatility(data[id].Close);Print("Delta:" + Text(Delta(TradingDayLeft, StrikePrice, data[id].Close, 5, volty, OptionType, OptionStyle)));}