Error help please

[CKnudsen]

I get the following error message sometimes at the start of the trading day. Always with the same symbols. most symbols are fine. The error occurs with symbols with very few trades the previous day.

Error Message:
Indicator 'aBDS': Error on calling 'OnRender' 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.

BarsRequiredToPlot = 5;
Bars2Avg = 5;

if (BarsRequiredToPlot < 5 || CurrentBar < Bars2Avg)
return;

if (CurrentBar > Bars2Avg && CurrentBar > BarsRequiredToPlot && ToTime(Time[1]) > ToTime(9, 30, 00) && ToTime(Time[0]) <= ToTime(16, 00, 00) && GetCurrentBid() > 0 && GetCurrentAsk() > 0)
{
// My Indicator logic
}

Max bars back used is 4


What am I missing?

[NinjaTrader_Jesse]

Hello CKnudsen,

Thank you for the post.

My first question related to this error would be, are you using the OnRender override in the script?
If so, is the syntax provided being used in OnRender? If not can you provide the syntax in OnRender?

The error seems to be coming from OnRender, or an item that utilizes OnRender during the execution of bar 0.

I look forward to being of further assistance.

[CKnudsen]

I don't find OnRender in the script. Should I be using it?

[NinjaTrader_Jesse]

Hello CKnudsen,

Only if you need to, OnRender is for more complex rendering but is not required to be used in your scripts.

The reason I had asked is that the error you are seeing is coming from OnRender, but if you are not using OnRender the error is likely coming from something else that does use OnRender like a DrawingTool for example.

As you noted this occurs sometimes, it would likely be best to wait for the next occurrence of this and note the time and instrument used along with other chart settings or relevant details to set the script up. If you could then test that time period in the Playback connection to see if the error is generated that would be very helpful if you can recreate it. If you cannot download data for the instrument, you may try enabling recording for playback so you can try to recreate the error.

Once you find a case where you can recreate it at least sometimes at command, what I would likely suggest is to further reduce your syntax until the problem goes away to locate what specifically causes the error in the syntax used. We could then look at that syntax to see why that may be happening.

From what you have provided, I don't see what would be causing the error as there is nothing using OnRender in that sample. If you are using other indicators, drawing objects or anything else external to the script you might try commenting out those items while testing first.

I look forward to being of further assistance.