please detect the problems with the code below: 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using cAlgo.API;
using cAlgo.API.Collections;
using cAlgo.API.Indicators;
using cAlgo.API.Internals;

namespace cAlgo.Robots {
    [Robot(TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class CustomScalpingBot2 : Robot {
        // Declare higherTimeframeEnum outside of OnStart()
        private TimeFrame higherTimeframeEnum;
        private ExponentialMovingAverage emaFast;
        private ExponentialMovingAverage emaSlow;
        private MovingAverage sma;
        private MovingAverage ema;
        private BollingerBands bollingerBands;
        private RelativeStrengthIndex rsi;
        private AverageTrueRange atr;
        private StochasticOscillator stochastic;
        private Bars higherTimeframeBars;
        private ExponentialMovingAverage higherTimeframeEmaFast;
        private ExponentialMovingAverage higherTimeframeEmaSlow;
        private MacdHistogram macd;
    
        [Parameter("Risk Percentage", DefaultValue = 0.01, MinValue = 0.01, MaxValue = 0.1, Step = 0.01)]
        public double RiskPercentage { get; set; }

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

        [Parameter("Ema Slow Periods", DefaultValue = 20)]
        public int EmaSlowPeriods { get; set; }

        [Parameter("Enable Trailing Stop", DefaultValue = true)]
        public bool EnableTrailingStop { get; set