The-GannSwing-indicator-returns-NaN-for-every-bar

The GannSwing indicator returns NaN for every bar. It's kind of boring. I was expecting something more. I'm running PowerPack Build 23 on WL8 Build 39.

CODE:
using WealthLab.Backtest;
using WealthLab.Core;
using WealthLab.PowerPack;

namespace WealthScript4 
{
    public class MyStrategy : UserStrategyBase
    {
        //create indicators and other objects here, this is executed prior to the main trading loop
        public override void Initialize(BarHistory bars)
        {
         indicator = new GannSwing(bars,true);
         for (int bar = 0; bar < bars.Count; bar++)
            WriteToDebugLog(bar.ToString("#   ") + indicator[bar]);
           PlotIndicator(indicator);
        }

      public override void Execute(BarHistory bars, int idx) { }

      private GannSwing indicator;
    }
}