"OnBarUpdate"... Bar1 Array Error

[Yannick]

Hello,

I get the following error when I run the strategy:

Strategy '....': Error calling 'OnBarUpdate' Method at bar 1: The index was outside the array area.

I created the strategy with the Strategy Builder

Thank you for your help

[NinjaTrader_ChelseaB]

Hello Yannick,

What version of NinjaTrader 8 are you using? (Help > About)

Are there other errors appearing in the Log tab of the Control Center? (Is the FBOdown indicator experiencing an error?)

[Yannick]

It is the version: 8.0.20.1 64-bit

I also tested the indicator again in the chart. But I didn't get an error message.

I only get the error message when I want to run a backtest

[NinjaTrader_Jesse]

Hello Yannick,

Thanks for that information.

Is the indicator something you have the code for?

Also do you still see the error if you form the condition to use a standard indicator like the SMA in place of your indicator? That would just help to confirm the problem is specifically the indicator and not another part of your script.

I look forward to being of further assistance.

[Yannick]

In the appendix you will find the code of the indicator. The code is actually very short. The indicator only calculates the Fibo value.

With the other strategies / indicators I do not get an error message.
What did I do wrong in the Strategy Builder?

[NinjaTrader_Jesse]

Hello Yannick,

Thank you for the details.

From the image I don't see anything specifically wrong with how you used in indicator.

In the code of the indicator it may be that it is not setting a value each bar, you might try this as a test to see if that is the case.

Add the following to the indicator and then compile:

protected override void OnBarUpdate()
{

PreisTief[0] = 0;

// existing code

Otherwise if you can export the strategy and indicator and attach them I could review that further to see what may be happening.

I look forward to being of further assistance.

[Yannick]

First of all thank you for your effort and help! I hope we can solve the problem,

I uploaded the files

Best Regards

[Yannick]

Have you had a chance to check it out?

I thought maybe this could be the problem: https://ninjatrader.com/support/help...getvalueat.htm

But unfortunately that didn't help either or I did it wrong ...

Best Regards

[NinjaTrader_Jesse]

Hello Yannick,

Thank you for the reply.

I was able to take a look into the situation, it looks like this is caused by the indicator. The way the indicator is programmed does not expose a plot which is how the strategy is trying to access the data, this causes an error.

The indicator just needs to use a Plot instead of a Series<double>, you can find an example in the following page: https://ninjatrader.com/support/help...ghtsub=addplot

After adding a plot you would replace:

PreisTief[0] = Price1;

with

Value[0] = Price1;

You will also need to remove my prior comment of: PreisTief[0] = 0;


I look forward to being of further assistance.

[Yannick]

I really thank you very much! The error message is gone for now!

Could I set it up in Strategy Builder to save the value? I want , that the strategy
goes long, when touching or falling below the price

Would be grateful for any tip and help!

Best Regards!

[NinjaTrader_Jesse]

Hello Yannick,

It looks like that indicator only sets a value when the condition is true, you would need to have the indicator do this type of saving or more specifically plotting of a value.

You can likely add the following to the indicator to do that:

if(CurrentBar < 1 ) return;  // < -- this is already in the file
Value[0] = Value[1];  // <- add this line below the above line in the file

You can otherwise store values in the builder by using a variable and setting it to the value you wanted.


I look forward to being of further assistance.

[Yannick]

Thank you very much. It works now!
Thanks again