Why doens take Positions?

i have here this code, why it doesnt take positions?

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

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

        [Parameter("Source1")]
        public DataSeries Source1 { get; set; }


        [Parameter("Source2")]
        public DataSeries Source2 { get; set; }

        [Parameter("MA1", DefaultValue = 3)]
        public int Period { get; set; }


        [Parameter("MA", DefaultValue = 10)]
        public int Periods { get; set; }


        [Parameter("Volume", DefaultValue = 1000)]
        public int Volume { get; set; }




        private MovingAverage firstMA1;
        private MovingAverage doubleMA;


        private const string label = "EMA";

        private Position longPosition;
        private Position shortPosition;


        protected void Initialize()
        {
            doubleMA = Indicators.SimpleMovingAverage(Source2, Periods);


            firstMA1 = Indicators.SimpleMovingAverage(Source1, Period);



        }



        protected override void OnStart()
        {



// Put your initialization logic here

        }

        protected override void OnTick()
        {
            // Put your core logic here
        }

        protected override void OnBar()
        {

            var cBotPositions = Positions.FindAll(label);

            longPosition = Positions.Find(label, Symbol, TradeType.Buy);
            shortPosition = Positions.Find(label, Symbol, TradeType.Sell);

            if (cBotPositions.Length >= 1)
                return;

            if (doubleMA.Result.Last(0) > firstMA1.Result.Last(0) && longPosition == null)
            {
                CP();

                ExecuteMarketOrder(TradeType.Buy, Symbol, Volume);
            }

            if (doubleMA.Result.Last(0) < firstMA1.Result.Last(0) && shortPosition == null)
            {
                CP();

                ExecuteMarketOrder(TradeType.Sell, Symbol, Volume);
            }


        }



        private void CP()
        {
            foreach (var Position in Positions)
            {
                ClosePosition(Position, Volume);

            }
        }

        protected override void OnStop()
        {
            // Put your deinitialization logic here
        }
    }
}

what is missing?

Thank you a lot.