DrawRectangle - error

[tradinginzen]

DrawRectangle("Second Resistance Cluster", false, 10, r4, 1, r3, Color.Crimson, Color.Crimson, 5);
                    DrawRectangle("First Resistance Cluster", false, 10, r2, 1, r1, Color.Crimson, Color.Crimson, 5);
                    
                    DrawRectangle("Second Support Cluster", false, 10, s4, 1, s3, Color.Green, Color.Green, 5);
                    DrawRectangle("First Support Cluster", false, 10, s2, 1, s1, Color.Green, Color.Green, 5);

I get the exception:

Error on calling 'OnBarUpdate' method for indicator 'PivotClusters' on bar 0: PivotClusters.DrawRectangle: startBarsAgo out of valid range 0 through 0, was 10.

[NinjaTrader_RyanM1]

Hello TradingZen,

You're running into this issue:
Make sure you have enough bars in the data series you are accessing

You can resolve by adding a CurrentBar check in your OnBarUpdate() method.

if (CurrentBar < 10)
return;

[tradinginzen]

awesome, thanks... is there a way to tell if it is the last bar on the chart?

[NinjaTrader_RyanM1]

Bars.Count is not a supported property, but you can use it to determine last bar on chart.

When CalculateOnBarClose == false, then OnBarUpdate() is being called for the last bar on the chart:

if (CurrentBar == Bars.Count - 1)


When CalculateOnBarClose == true, then OnBarUpdate() is being called for the last closed bar on the chart, not thein processbar:

if (CurrentBar== Bars.Count -2)