Error on calling the OnBarUpate

[mwave]

Hello

I m trying to run simple code

if (High[0] > High[1] && High[1] > High[2])
Print("Two successive higher highs");
DrawArrowDown("My down arrow" + CurrentBar, true, 0, High[0] + TickSize, Color.Blue);

I m getting "Error on calling the onBarupdate method for indicator Myindi on bar U:index was out of range.Must be non-negative and less than the size of the collection Parameter name:index"
it happen whenever i compare current bar with previous bar [1].its work fine if i compare current bar like Open[0] > Close [0]

Do i need to initialize something to run this code?

Thanks
mwave

[NinjaTrader_Bertrand]

mwave, you try accessing bars at the start of the chart that are present in the dataseries you're referring to (for example there's no High[1] defined at the first bar of the chart). You can add this check to the start of your OnBarUpdate -

 
if (CurrentBar < 2) return;

http://www.ninjatrader-support2.com/vb/showthread.php?t=3170

[mwave]

Thanks Bertrand, Its work!