Problem with an instance of indicator

[jairotunior]

Hi,

I am developing a strategy in strategy builder but a I have the following error:

Indicator 'ADXVMAColorBand': Error on calling 'OnStateChange' method: Object reference not set to an instance of an object.

The indicator is displayed in the chart perfectly, only have problems when I create a simple strategy using it.

I attached the code and the indicator.

Thanks,

[NinjaTrader_Jim]

Hello jairotunior,

Thanks for opening the thread. And welcome to the forums!

The error is reporting a runtime error for that indicator in the OnStateChange() method. I recommend reaching out to the developer of this indicator and let them know you are hitting this issue when adding the indicator to a strategy.

If you would like to debug and fix the issue yourself, I recommend adding prints after each line in OnStateChange() under State.SetDefaults and State.Configure so you can see which line of code throws the runtime error.

At a glance, I can say it would not be advised to check for ChartBars.ToIndex or ChartBars.FromIndex in State.DataLoaded or in State.Configure since these objects will not be available until rendering has started on a chart. I would instead recommend to get this value after rendering has started and check for it as early as State.Historical.

I've included a link on debugging - https://ninjatrader.com/support/foru...ead.php?t=3418

You may also hire a NinjaScript Consultant who would be happy to review this code and apply any needed fixes. If that is the case, please let me know and I can have a member of our business development team reach out with additional information.