Error on calling 'OnMarketData' method on bar -1

[balltrader]

A google search for this phrase did not reveal any posts in relation to OnMarketData, so I'm adding this...

Error on calling 'OnMarketData' method on bar -1: 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.,

Make sure the indicator's property "Calculate" is set to "On Every Tick"

[NinjaTrader_ChrisL]

Hello balltrader,

Thanks for the post.

Could you kindly copy/paste your OnMarketData method here? Likely, you will need to ensure that you are not referencing a bar that does not exist yet. For instance, if you try to reference Close[2] when CurrentBar is = 1 you will get this error.

EX:

... 
if(CurrentBar < 2)
return;

double val = Close[2];
...

I look forward to being of further assistance.

[balltrader]

my OMD method was empty, everything commented out, and no reference to any previous bars, yet the error persisted.

I'm pretty sure in this case it was bcuz the indicator was already on the chart with it's calculation mode set to "on bar update", then I added some code for the OnMarketData event, and when it was trying to process tick replay of the data series, the first bar had not finished processing, and the bar index pointer was probably -1, and this error was thrown.

this post is just a helper in case someone else has this scenario and can't find anything from a google search of the forums

[brucelevy]

I am receiving this error: bar out of valid range 0 through -1, was 0.

But only when I am attempting to plot a dot: DrawDot("MyDot", false, 0, e.Position, Color.Blue);

If I take that line out the code will continue to print to the output window.

[NinjaTrader_ChrisL]

Hello brucelevy,

Thanks for the post.

Have you added a CurrentBars check to make sure you have at least one bar on the chart before you draw?

if(CurrentBar < 1)
return;

I look forward to being of further assistiance.

[balltrader]

@bruce,

your code appears to be NT7, this is an NT8 forum

read this post to see if this is what is happening when you try to plot a dot in the past on a bar that doesn't exist:

https://ninjatrader.com/support/forum/showthread.php?t=72598