OnStateChange method Error

[asmmbillah]

Hi,
I am getting this below error:
"Strategy name: Error on calling 'OnStateChange' method: index was outside the bounds of the array". I have already checked your other forum posts realted to it and nothings sovles the error issue. Before you suggest me, I have alrady used print to debug and also used VS to find where its getting the null.

I am enabling the strategy and running on market replay data. after running it for sometime, when I am changing the market replay data date to the past, it is disabling the strategy and not re-enabling the strategy and showing the error, unlike other strategies doing the same.

Please find my prints and place where the null value is coming from below:
protected override void OnStateChange()
{
Print(0);
if (State == State.SetDefaults)
{
}
else if (State == State.Configure)
{
Print(1);
AddDataSeries(); // This is where the null value is coming from.
}
else if (State == State.Historical)
{
Print(2);
}
else if (State == State.Transition)
{
Print(3);
}
else if (State == State.DataLoaded)
{
Print(4);
}
else if (State == State.Terminated)
{
Print(5);
}
Print(6+"====================================");
}

When I first enable and run the strategy, it print starting with 0 and ends with 6, but when I change the market replay data, it only prints 6, never goes to 0. With help of VS, I found below is giving null value:
else if (State == State.Configure)
{
Print(1);
AddDataSeries(); // This is where the null value is coming from.
}
In AddDataSerires, I am using ChartBars.ToIndex to calculate no of barstoload.

Looking forward to your reply.

[NinjaTrader_Jim]

Hello asmmbillah,

Thanks for your post.

ChartBars.ToIndex is the far right bar that is visible on the chart. It should only be used for custom rendering, and should not be used outside of OnRender().

Please see documentation below for what would be valid use of AddDataSeries().

AddDataSeries() - https://ninjatrader.com/support/help...dataseries.htm

For a better understanding on the NinjaScript LifeCycle and how scripts pass through different states, I recommend reviewing the documentation below in addition to clearing your prints, and creating a test strategy that does only does the following:

protected override void OnStateChange()
{
    Print(State);
}

https://ninjatrader.com/support/help...fecycle_of.htm

https://ninjatrader.com/support/help...tatechange.htm

Publicly available video - https://www.youtube.com/watch?v=gyel...EYKym&index=17

If you still have questions minding the above or are still hitting errors, please copy the full line of code that is throwing the error so we can share our insight.

We look forward to assisting.

[asmmbillah]

Hi Jim, Thanks for your reply. In that case, within state.Configure, is it possible to get the index of far right bar?

[NinjaTrader_Jim]

Hello asmmbillah,

No, understanding which bar is going to be on the far right depends on the data that is loaded and what bars are rendered on the chart. This information would not be available in State.Configure.

Please let us know if you have any additional questions.