Odd error; strategy immediately disables.

[alphatango]

Hey folks. I'm hoping you can help. I've been away for the holidays and came back. I made 1 tweak to my algorithm and now it immediately disables whenever I try to use it on a chart. I've found this in the logs (thankfully). Can anyone tell me what now doesn't work?

Log says:
Strategy '[strategyname]': Error on calling 'OnBarUpdate' method on bar 0: You are accessing an index with a value that is invalid since it is out-of-range. I.E. accessing a series [barsAgo] with a value of 5 when there are only 4 bars on the chart.

All I did was add an if statement within another if statement. Now it tells me that I'm trying divide by 0 or something. I literally changed nothing.

[NinjaTrader_ChelseaB]

Hello alphatango,

The error means you are using an invalid index on a collection.

For example using Close[1] when CurrentBar is 0 will cause this error.

Below is a link to a forum post that discusses.

https://forum.ninjatrader.com/forum/ninjatrader-8/indicator-development/1046200-indicator-that-calculate-in-different-chartime#post1048513

What is the specific code in your script causing an error?

[alphatango]

It doesn't tell me what line throws the error.
in fact, it compiles just fine. No errors. I'm not sure why it compiles, but throws errors post-editting.

Now it won't activate and says this.
Strategy 'MultiTimeframe': Error on calling 'OnStateChange' method: Index was outside the bounds of the array.

I'm not sure how to force it to load the array more than I already have.

EDIT:

Found out it was something to do with plotting for a couple of moving averages I can't seem to get it to propagate. I was told I could add multiple timeframes to a chart. Not sure if I need to start a new thread for this.

[NinjaTrader_ChelseaB]

Hello alphatango,

AddDataSeries() must be called in State.Configure.

Indicators must be instantiated in State.DataLoaded (on OnBarUpdate()).

"It doesn't tell me what line throws the error."

You will need to add debugging prints to determine which line is causing the error.

Below is a link to a support article on adding debugging prints to understand behavior.

https://support.ninjatrader.com/s/article/Developer-Guide-Debugging-using-Print-and-TraceOrders

Try printing the line number before each assignment, method call, and branching command you have added.


" I was told I could add multiple timeframes to a chart"

Plots are synchronized to the primary series only. But you can add an additional data series, and plot the information from that added series over the primary series.

Below is a link to an example.

https://ninjatrader.com/support/forum/forum/ninjatrader-8/indicator-development/105828-indicator-accessing-multiple-time-frame?p=820196#post820196

[alphatango]

I found what was giving me grief. The print statement helped get me through.