My-Strategy-doesn-t-open-positions

Hello,

I can't see the error. Maybe anybody can help me. I am getting no positions!
Thanks in advance.

CODE:
using WealthLab.Backtest;
using WealthLab.Core;
using WealthLab.Indicators;
using System.Drawing;

namespace StrategiesCollection
{
   public class Template : UserStrategyBase

   {

      public Template() : base()
      {
         AddParameter("PeriodFast", ParameterTypes.Int32, 25, 0, 100, 5);
         AddParameter("PeriodSlow", ParameterTypes.Int32, 100, 0, 200, 5);
      }


      //create indicators and other objects here, this is executed prior to the main trading loop
      public override void Initialize(BarHistory bars)
      {
         _emaFast = EMA.Series(bars.Close, Parameters[0].AsInt); 
         PlotIndicator(_emaFast, Color.Blue, PlotStyles.DashedLine, true, "emaFast");


         _emaSlow = EMA.Series(bars.Close, Parameters[1].AsInt);
         PlotIndicator(_emaSlow, Color.Crimson, PlotStyles.DottedLine, true, "emaSlow");


         StartIndex = 50;
      }

      //execute the strategy rules here, this is executed once for each bar in the backtest history
      public override void Execute(BarHistory bars, int idx)
      {
         _enterLong = _emaFast.CrossesOver(_emaSlow, idx);
         _enterShort = _emaSlow.CrossesUnder(_emaFast, idx);

         _exitLong = bars.Close[idx] < _emaFast[idx];
         _exitShort = bars.Close[idx] > _emaSlow[idx];


         if (!HasOpenPosition(bars, PositionType.Long))
         {
            if (_enterLong)
            {
               PlaceTrade(bars, TransactionType.Buy, OrderType.Market);

            }


            if (!HasOpenPosition(bars, PositionType.Short))

               if (_enterShort)

               {
                  PlaceTrade(bars, TransactionType.Short, OrderType.Market);
               }


               else
               {

                  var isLastPositionActive = HasOpenPosition(bars, PositionType.Long) || HasOpenPosition(bars, PositionType.Short);

                  if (isLastPositionActive)
                  {
                     Position p = LastPosition;

                     if (p.PositionType == PositionType.Long)
                     {

                        if (_exitLong)

                        {
                           ClosePosition(p, OrderType.Market);
                        }

                        else
                        {
                           if (p.PositionType == PositionType.Short)
                           {


                              if (_exitShort)

                              {
                                 ClosePosition(p, OrderType.Market);
                              }
                           }
                        }
                     }
                  }
               }
         }
      }


      //declare private variables below
      private bool _enterLong;
      private bool _enterShort;
      private bool _exitShort;
      private bool _exitLong;

      private IndicatorBase _emaFast;
      private IndicatorBase _emaSlow;

   }
}

Kind regard