Help

using System;
using System.Linq;
using cAlgo.API;
using cAlgo.API.Indicators;
using cAlgo.API.Internals;
using cAlgo.Indicators;

namespace cAlgo.Robots
{
    [Robot(TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class MASD : Robot
    {

        [Parameter("Source")]
        public DataSeries Source { get; set; }



        [Parameter("MA_short_value", DefaultValue = 5)]
        public int MA_5 { get; set; }

        [Parameter("MA_long_value", DefaultValue = 12)]
        public int MA_12 { get; set; }



        [Parameter("Stop Loss", DefaultValue = 15)]
        public double SL { get; set; }
        [Parameter("Take Profit", DefaultValue = 30)]
        public double TP { get; set; }
        [Parameter("Quantity (Lots)", DefaultValue = 1, MinValue = 0.01, Step = 0.01)]
        public double Quantity { get; set; }





        private SimpleMovingAverage _ma12;
        private SimpleMovingAverage _ma5;
        private StandardDeviation _SD;
        private Position longPosition;
        private Position shortPosition;


        protected override void OnStart()
        {
            _ma12 = Indicators.SimpleMovingAverage(Source, MA_12);
            _ma5 = Indicators.SimpleMovingAverage(Source, MA_5);
            _SD = Indicators.StandardDeviation(MarketSeries.Close, 10, MovingAverageType.Simple);
        }



        protected override void OnTick()
        {

            longPosition = Positions.Find("OrdineVendere", Symbol, TradeType.Buy);
            shortPosition = Positions.Find("OrdineComprare", Symbol, TradeType.Sell);
            var previous_ma5 = _ma5.Result.Last(1);
            var previous_ma12 = _ma12.Result.Last(1);
            var current_ma5 = _ma5.Result.Last(0);
            var current_ma12 = _ma12.Result.Last(0);
            var current_SD = _SD.Result.Last(0);
            var previous_SD = _SD.Result.Last(1);

            if (previous_ma5 < previous_ma12 && current_ma5 >= current_ma12)
            {
                // if (_SD.Result.Last(0) > _SD.Result.Last(1))

                ExecuteMarketOrder(TradeType.Buy, Symbol, Quantity, "OrdineComprare", SL, TP);

            }




            if (previous_ma5 > previous_ma12 && current_ma5 <= current_ma12)
            {


                if (previous_SD < current_SD)


                    ExecuteMarketOrder(TradeType.Sell, Symbol, Quantity, "OrdineVendere", SL, TP);

            }


            if (current_SD < previous_SD)
            {
                var position2 = Positions.Find("OrdineComprare");
                ClosePosition(position2);
            }


            if (current_SD < previous_SD)
            {
                var position1 = Positions.Find("OrdineVendere");
                ClosePosition(position1);
            }

        }









        protected override void OnStop()
        {

        }
    }

}

Hi,

I have just started programming and I have no idea where is the problem. Thank you for any help.