Multi Objective Optimizer Problems

[timmbbo]

NT Support Dudes:


When I attempt a Multi Objective Optimizer run, I get "Error on calling 'OnStateChange' method: Object reference not set to an instance of the object." When I run the same strategy through the Optimizer, no problem. Googling this issue, there's all sorts of ways this error can occur, and possible resolutions as well.

Your thoughts on how to resolve? Thanks,

[NinjaTrader_Gaby]

Hello timmbbo,

Thank you for your post.

The error message "Object reference not set to the instance of an object" means that something in the script is returning null at the time you are accessing it. Debugging using prints would be necessary to determine what exactly is returning null in the script. Below is a Help Guide page that explains in detail.

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

Are you perhaps calling AddDataSeries() dynamically in the script? Where / how are your strategy's properties defined in OnStateChange()?

Please let us know if you need further assistance.

[timmbbo]

Gaby, thanks. I was eventually able to isolate the section of code causing grief, and IsInStrategyAnalyzer to leave it out of a run.