Vars

   Global Integer id(0);

   Global Bool subFlag(False);

Events

   OnReady()

   {

       if(!subFlag)

       {

           id = SubscribeBar(RelativeSymbol, \"1d\", BeginDateTime);

           subFlag = True;

       }

   }

   OnBar(ArrayRef<Integer> indexs)

   {

       Numeric volty = Volatility(data[id].Close);

       Print(\"Option_ImVolatility:\" + Text(Option_ImVolatility(Close, data[id].Close, StrikePrice, TradingDayLeft, 5, volty, 2, OptionType, 240)));

   }

在中证1000认沽合约的图表上载入这个策略，不显示具体数值，控制台显示是N/A,请问怎么结局