Error message (New to coding)

Hey guys, this is the code. 

see if and else if please.

namespace cAlgo.Robots
{
    [Robot(TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class NNFXBot : Robot
    {
        [Parameter(DefaultValue = 0.0)]
        public double Parameter { get; set; }

        //Create indicator variables
        private AverageTrueRange atr;
        private MacdCrossOver macd;

        protected override void OnStart()
        {
            //load indicators on start up
            atr = Indicators.AverageTrueRange(14, MovingAverageType.Exponential);
            macd = Indicators.MacdCrossOver(26, 12, 9);

        }

        protected override void OnBar()
        {
            //Calculate Trade Amount Based on ATR        
            var PrevATR = Math.Round(atr.Result.Last(1) / Symbol.PipSize);
            var TradeAmount = (Account.Equity * 0.05) / (1.5 * PrevATR * Symbol.PipValue);
            TradeAmount = Symbol.NormalizeVolumeInUnits(TradeAmount, RoundingMode.Down);

            //Zero line Cross Example
            var Histogram = macd.Histogram.Last(1);
            var prevHistogram = macd.Histogram.Last(2);

            //Check for trade signal
            if (Histogram boo 0 % prevHistogram < 0)
            {
                ExecuteMarketOrder(TradeType.Buy, SymbolName, TradeAmount, "MACD", 1.5 * PrevATR, PrevATR);
            }
            else if (Histogram < 0 % prevHistogram > 0)
            {
                ExecuteMarketOrder(TradeType.Sell, SymbolName, TradeAmount, "MACD", 1.5 * PrevATR, PrevATR);
            }

        }

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

Error Code:

Error NNFX Bot.cs: Operator '<' cannot be applied of type 'bool' and 'int'

Error NNFX Bot.cs: Operator '>' cannot be applied of type 'bool' and 'int'

How would I be able to fix these errors? 

cheers.