cbot only working for a short history.

When I try to run my CBot for backtesting larger past data sets, it crashes. Is there a problem with what I'm doing below? I am trying to close time after 2 min.

using cAlgo.API;
using System;
using cAlgo.API.Indicators;
using cAlgo.Indicators;
namespace cAlgo
{
    [Robot(TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class NewcBot : Robot
    {
        [Parameter("Quantity (Lots)", Group = "Volume", DefaultValue = 1, MinValue = 0.01, Step = 0.01)]
        public double Quantity { get; set; }

        [Parameter(DefaultValue = 14, MinValue = 2)]
        public int Period { get; set; }

        [Parameter(DefaultValue = 5)]
        public int PeriodK { get; set; } 

        [Parameter(DefaultValue = 3)]
        public int PeriodD { get; set; }

        [Parameter(DefaultValue = 1)]
        public int Timeru { get; set; }

        private STOCHcciIndicator Stochcci;
        protected override void OnStart()
        {
           Stochcci = Indicators.GetIndicator<STOCHcciIndicator>(Period,PeriodK,PeriodD);
        }
        protected override void OnBar()
        {
            
            var volumeInUnits = Symbol.QuantityToVolumeInUnits(Quantity);

            if (((Stochcci.StochCCIv.Last(1) < 20 )&& (Stochcci.Trigger.Last(1) > 30)) && Positions.Count ==0)
            {

              
                ExecuteMarketOrder(TradeType.Buy, SymbolName, volumeInUnits, "Buy");
            }

            else if (((Stochcci.StochCCIv.Last(1) > 80 )&& (Stochcci.Trigger.Last(1) < 70)) && Positions.Count ==0)
            {
              
                ExecuteMarketOrder(TradeType.Sell, SymbolName, volumeInUnits, "Sell");
             }
             if(Bars.OpenTimes.Last(0) - LastResult.Position.EntryTime >= TimeSpan.FromMinutes( Timeru ))
             {
            foreach ( var position in Positions)
            {
            ClosePosition(position);
            }
             }
        }
        
    }
}