Index out of bounds while running the optimizer

[alexismailhot]

Hello,

I have a problem while running the optimizer on my strategies.

I randomly get errors like this : Strategy 'X': Error on calling 'OnBarUpdate' method on bar X: Index was outside the bounds of the array.

As I said, those errors happens randomly. The bar number that causes the error always changes between optimization (even with identical optimization parameters), and sometimes there are no errors at all (optimization runs fine and returns the results).

Also, I never get these errors while backtesting or while running my strategies live.

I searched the forum, and found this post : https://ninjatrader.com/support/foru...x-out-of-range
However, the solution mentioned in there didn't solve my problem.

Did anyone ever experienced this problem? Do anyone know why those errors could be so random?

Thank you,
Alexis

[NinjaTrader_ChrisL]

Hi Alexis, thanks for your post.

This would happen because some aspect of your script is accessing an array index that is not there. E.g. If you run an optimization with parameters that get used to index an array like X 1;20;1,
If its bar 0 and the script accesses Close[X] where X = 1 you would get this problem. You can also try this with Visual Studio Debugging to break when a .NET exception occurs:

https://ninjatrader.com/support/helpGuides/nt8/?visual_studio_debugging.htm