Indicator Error - not plotting when applied.

[cogtrade]

I applied a new indicator I built to the chart and once applied the indicator is blank with nothing showing. It compiles correctly without any errors and when I check the log I get the following error.


Indicator ‘DeltaVolume’: Error on calling ‘OnBarUpdate’ method on bar 0: ‘AddPlot’ cannot be called from this state. Please see the Help Guide Article.


I have tried a number of solutions from the help guid and forum and nothing seems to work.

###########

namespace NinjaTrader.NinjaScript.Indicators
{
      public class DeltaVolume : Indicator
      {
            protected override void OnStateChange()
            {
                  if (State == State.SetDefaults)
                  {
                        Description                                                  = @"Enter the description for your new custom Indicator here.";
                        Name                                                          = "DeltaVolume";
                        Calculate                                                     = Calculate.OnEachTick;
                        IsOverlay                                                     = false;
                        DisplayInDataBox                                        = true;
                        DrawOnPricePanel                                      = true;
                        DrawHorizontalGridLin es                           = true;
                        DrawVerticalGridLines                                 = true;
                        PaintPriceMarkers                                       = true;
                        ScaleJustification                                         = NinjaTrader.Gui.Chart.ScaleJustification.Right;
                        //Disable this property if your indicator requires custom values that cumulate with each new market data event.
                        //See Help Guide for additional information.
                  
                  }
                  else if (State == State.Configure)
                  {
                  }
            }

            protected override void OnBarUpdate()
            {
                             
                  //Add your custom indicator logic here.

                  
      double currentBidVolume;
      double currentAskVolume;

currentBidVolume = GetCurrentBidVolume();

currentAskVolume = GetCurrentAskVolume();
                  
// Calculate the bid/ask volume delta //

double volumeDelta = (currentBidVolume - currentAskVolume) / (currentBidVolume + currentAskVolume);
                  
      
// Check if the volume delta is over 25% or below -25% //

{
            
// Check if the volume delta is over 25% or below -25% //

if (volumeDelta > 0.25)

{
      
      // Plot a green bar //

AddPlot(new Stroke(Brushes.LawnGreen, 1), PlotStyle.Bar, "Green");

}



      else if (volumeDelta < -0.25)

{
            
            

AddPlot(new Stroke(Brushes.Red, 1), PlotStyle.Bar, "Red");

}
      
      else

{

// Don't plot a bar //

AddPlot(new Stroke(Brushes.Transparent, 1), PlotStyle.Bar, "None");

}

            }     
                  }

[NinjaTrader_ChelseaB]

Hello cogtrade,

Welcome to the NinjaTrader forums!

The error message is absolutely correct. You cannot call AddPlot() in OnBarUpdate().

Below is a link to the help guide on AddPlot().
https://ninjatrader.com/support/help...t8/addplot.htm

Note from the help guide:
"Warning: This method should ONLY be called within the OnStateChange() method during State.SetDefaults or State.Configure"

Once a plot is added in State.SetDefaults or State.Configure, you can choose whether to set a plot value to the Values[plot index][barsAgo index] collection. If no plot value is set, no plot will appear. If a plot value is set a plot will appear.
https://ninjatrader.com/support/help...nt8/values.htm

If you are trying to set the color of a plot for a specific bar, this is done by setting PlotBrushes[plot index][barsAgo index].

https://ninjatrader.com/support/helpGuides/nt8/plotbrushes.htm