Crashed in OnStart with ArgumentException: Incorrect parameters count. (Parameter 'parameterValues')

Having a go at making a cBot nothing too complex just want to see how things perform and wether it is worth all the stress.

I have managed to get this far and it saves with no errors or faults however when starting it the message comes up: 
Crashed in OnStart with ArgumentException: Incorrect parameters count. (Parameter 'parameterValues')

Can somebody please advise to where my errors are? First time coding so not a clue what I have done wrong -.-

using cAlgo.API;
using cAlgo.API.Indicators;

namespace cAlgo.Robots
{

    [Robot(TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class NewcBot : Robot
    {
        private double _volumeInUnits;

        private Supertrend _supertrend;
        private ExponentialMovingAverage _ema200;
        private DEMA200 _DEMA;

        [Parameter("Volume (Lots)", DefaultValue = 0.01)]
        public double VolumeInLots { get; set; }

        [Parameter("Label", DefaultValue = "Label")]
        public string Label { get; set; }
        

        public Position[] BotPositions
        {
            get { return Positions.FindAll(Label); }
        }

        protected override void OnStart()
        {
            _volumeInUnits = Symbol.QuantityToVolumeInUnits(VolumeInLots);
            
            _supertrend = Indicators.Supertrend(12, 3);
            
            _ema200 = Indicators.ExponentialMovingAverage(Bars.ClosePrices, 200);
            
            _DEMA = Indicators.GetIndicator<DEMA200> (Bars.ClosePrices, 200) ;
        }

        protected override void OnBar()
        {
            if (_supertrend.UpTrend.Last(1) < Bars.LowPrices.Last(1) && _supertrend.DownTrend.Last(2) > Bars.HighPrices.Last(2) && Bars.ClosePrices.Last(1) < _ema200.Result.Last(1) && Bars.ClosePrices.Last(1) < _DEMA.Result.Last(1))
            {
                ClosePositions(TradeType.Sell);

                ExecuteMarketOrder(TradeType.Buy, SymbolName, _volumeInUnits, Label);
            }
            
            
            
            else if (_supertrend.DownTrend.Last(1) > Bars.HighPrices.Last(1) && _supertrend.UpTrend.Last(2) < Bars.LowPrices.Last(2) && Bars.ClosePrices.Last(1) > _ema200.Result.Last(1) && Bars.ClosePrices.Last(1) > _DEMA.Result.Last(1))
            {
                ClosePositions(TradeType.Buy);

                ExecuteMarketOrder(TradeType.Sell, SymbolName, _volumeInUnits, Label);
            }
        }

        private void ClosePositions(TradeType tradeType)
        {
            foreach (var position in BotPositions)
            {
                if (position.TradeType != tradeType)
                    continue;

                ClosePosition(position);
            }
        }
    }
}