Object reference not set to an instance of an object.... ERROR

[forrestang]

Hello.

I am creating an indicator that references another indicator. I got it working, and it did just what I wanted it to.

Then I restarted ninja and BAM!!! I get the error shown in the picture.

It compiles fine, but I get the error and the indicator just won't plot.

The error I am getting seems to be related to THIS thread HERE. I really don't understand the problem?



My code snippet is below, and it seems the problem lies in the initialization of the dataseries I have called "swingRelation." I've commented everything else out in the void onBarUpdate block, and the problem occurs when I get to that condition that deals with that data series.

namespace NinjaTrader.Indicator
{
    /// <summary>
    /// Enter the description of your new custom indicator here
    /// </summary>
    [Description("This indicator kicks the market's ass")]
    public class FPCJTrend : Indicator
    {
        #region Variables
        //#####################################################################
        //Variables for PriceActionSwing
	private int swingSize = 2;
        private SwingTypes swingType = SwingTypes.Standard;
        private int dtbStrength = 15;
        private IDataSeries swingRelation = null;
        private IDataSeries swingTrend;
        private bool seeRelation = false;
        private bool useOldTrend = true;
        private bool paintBars = true;
        private int oldTrend = 0;
        private Color upTrendColour = Color.Green;
        private Color dnTrendColour = Color.Red;
        private Color noTrendColour = Color.Gray;
		
	//Variables for IchiCloud
	private int periodFast = 9;			// Default setting for PeriodFast
        private int periodMedium = 26;		// Default setting for PeriodMedium
        private int periodSlow = 52;		// Default setting for PeriodSlow
		
	//Variables independant to FPCJTrend
	private bool blueCloud = false;
	private bool redCloud = false;
	private int ichiBuffer = 6;
		
        //#####################################################################
        #endregion

        /// <summary>
        /// This method is used to configure the indicator and is called once before any bar data is loaded.
        /// </summary>
        protected override void Initialize()
        {
            
	    Add(new Plot(new Pen(Color.Firebrick, 20), PlotStyle.Square, "DoubleTop"));
            Add(new Plot(new Pen(Color.Red, 20), PlotStyle.Square, "DownTrend"));
            Add(new Plot(new Pen(Color.Gold, 20), PlotStyle.Square, "NoWhere"));
            Add(new Plot(new Pen(Color.Green, 20), PlotStyle.Square, "UpTrend"));
            Add(new Plot(new Pen(Color.Lime, 20), PlotStyle.Square, "DoubleBottom"));
			
            CalculateOnBarClose = true;
            Overlay				= false;
        }

        /// <summary>
        /// Called on each bar update event (incoming tick)
        /// </summary>
        protected override void OnBarUpdate()
        {	
			
			
	//if (CurrentBar < swingSize)		
         //return;							//Do we have enough bars for PriceActionSwing
			
	//if ((CurrentBar < periodMedium) || (CurrentBar < periodFast))
        //return;							// Do we have enough bars for Ichi Calculation
			
	if (CurrentBar < 1)
            {
                if (swingRelation == null && seeRelation)
                    swingRelation = PriceActionSwing(Input, dtbStrength, swingSize, swingType).SwingRelation;
				
                if (swingTrend == null && !seeRelation)
                    swingTrend = PriceActionSwing(Input, dtbStrength, swingSize, swingType).SwingTrend;
				
            }
			
			
		double spanA = IchiCloud(Input, periodFast, periodMedium, periodSlow).SenkouSpanA[0];
		double spanB = IchiCloud(Input, periodFast, periodMedium, periodSlow).SenkouSpanB[0];
						
		if(spanA > spanB)
			{
				blueCloud = true;	
				redCloud = false;
			}
			
		if(spanA < spanB)
			{
				redCloud = true;
				blueCloud = false;
			}
			/*
		if(redCloud == true)
			{
				DrawArrowDown("arrow"+CurrentBar, true, 0, Low[0]+12*TickSize, Color.Red);	
			}
		//Print(redCloud);
			*/
			
			///*
            if (swingRelation[0] == 1 && blueCloud == true && Low[0] > spanA-ichiBuffer*TickSize)
			{
				//UpTrend.Set(Close[0]);
				//DrawArrowUp("arrow"+CurrentBar, true, 0, Low[0]-12*TickSize, Color.Green);
				//Print("hi");
			}
            
			else if (swingRelation[0] == -1 && redCloud == true && High[0] < spanA+ ichiBuffer*TickSize)
			{
				//DownTrend.Set(1);
				//DrawArrowDown("arrow"+CurrentBar, true, 0, Low[0]+12*TickSize, Color.Red);
			}
			
			else
			{
				//NoWhere.Set(1);	
			}

............

[forrestang]

I may have figured something out.

I will post back if I need further help.

Thanks!

[NinjaTrader_Austin]

forrestang, sounds good. If you'd like additional information about this error, please see this link - http://www.ninjatrader.com/support/f...ead.php?t=4226.

[koganam]

Your dataSeries are wrongly declared.

IDataSeries is an interface. The dataSeries object is declared simply as DataSeries thus:

private [COLOR="Red"][B]DataSeries[/B][/COLOR] swingRelation = null;