IsInstantiatedOnEachOptimizationIteration reset indicator

[donto]

Hello Ninjatrader

When running with IsInstantiatedOnEachOptimizationIteration set to false i have some indicators that is giving me some wierd issues i am trying to troubleshoot.

I add all indicators to my strategies like this under data loaded. but when the IsInstantiatedOnEachOptimizationIteration set to false this line some times comes with errors.
I added a print before and after to nail down that it is this line.

Print(" Before TMA");

FiltersTMAInd = TMA(Close, FiltersTMAPeriod);

Print(" After TMA");


How do i actually reset the indicators and everything under it, Plots and variables.

Or should i change the indicators to reset all values under DataLoaded also ?

From reading the man pages i hot to clear differant types of variables but how do i clear a plot that is defined under state setDefaults ?
AddPlot(new Stroke(Brushes.Gold, 1), PlotStyle.Line, "Plotname");

Is it correctley understood a by instantiating an iSeries like this it is being instantiated as a new clear iSeries and does not need to be cleared ?
FiltersGlobal = new Series<bool>(this);

[NinjaTrader_ChelseaB]

Hello donto,

What is the full error message you are getting?

I've tested the suggested code and I am not seeing an error.
IsInstantedIndicatorCallTest_NT8.zip


"How do i actually reset the indicators and everything under it, Plots and variables."

The indicators are cached and automatically generate a new instance of the data or parameters are different. No need (or way) to reset this.

Plots and the Values collection are automatically reset (for a new generated instance).

"Or should i change the indicators to reset all values under DataLoaded also ?"

If your script has private (non-input) variables, these should be assigned initial values in State.DataLoaded (in all scripts).

"From reading the man pages i hot to clear differant types of variables but how do i clear a plot that is defined under state setDefaults ?
AddPlot(new Stroke(Brushes.Gold, 1), PlotStyle.Line, "Plotname");"

These are automatically reset (for a new generated instance).

"Is it correctley understood a by instantiating an iSeries like this it is being instantiated as a new clear iSeries and does not need to be cleared ?
FiltersGlobal = new Series<bool>(this);"

This is correct, this would generate a new instance, and this code should be in State.DataLoaded.

[donto]

Hello Chelsea

After two weeks of troubleshooting i have this issue pointed a bit further down.
I have written a bunch of indicators and a strategy that can use these indicators as filters, signals etc..

if i have everything uncompiled in my NinjaTrader instance i can run with IsInstantiatedOnEachOptimizationIteration set to false.

However if i compile some of these indicators exclude the code from Ninjatrader and imoports the compiled version i start getting this error under optimizations.

09-01-2025 19:31:38	Default	Strategy 'OT_ST_WaddahAttarExplosion': Error on calling 'OnStateChange' method: Object reference not set to an instance of an object.

From my strategy in State DataLoaded i have added these two prints to nail down the excact place where it throws me off.

Print("2 State " + State);

OT_WaddahAttarExplosion1 = OT_WaddahAttarExplosion(Close, Convert.ToInt32(Sensitivity), Convert.ToInt32(MACD_Fast), true, Convert.ToInt32(MACD_Smooth), Convert.ToInt32(MACD_Slow), true, Convert.ToInt32(MACD_Smooth), Convert.ToInt32(StDev_Bars), 2, DeadZone, true, true);
Print("3 State " + State);



And this is what is in my output windows.

2 State DataLoaded
Strategy 'OT_ST_WaddahAttarExplosion': Error on calling 'OnStateChange' method: Object reference not set to an instance of an object.
State Terminated


as you see it prints the line before the indicator but not the one after.

this happens for many of my indicators but why.
Am i doing something wrong ?

[NinjaTrader_ChelseaB]

Hello donto,

This suggests that the error is in the indicator. The indicator fails to construct and returns a null to the strategy.

Have you debugged the indicator?