So when LRO = -1, that means that there isn't one on screen, but I am running into trouble when calling a function when it = -1.

I have an if statement:

if (intLRO> -1)
{
if (High[intLRO] >= High[intLRO-1])
{
Print("yes lro > 1 and high of lro is >= high of lro-1)"
///should only print when both are true.
}
}

However, I keep getting : Error on calling 'OnBarUpdate' method on bar 37: 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.

This is in reference to (High[intLRO] >= High[intLRO-1])

However intLRO = -1

I'm cofused as to why it is firing when intLRO = -1.

FYI, this works fine on ninjatrader 7, even without having if (intLRO> -1) to catch it.

If you try to call something like High[-1], that bar would be in the future. That is why ninja trader is throwing an error. If an indicator or strategy tries to access the future your profit factor will go way up for any backtest, but your strategy will not perform well when run live.