Error in log on running simple volume check

[TiP2012]

I am trying to create some simple volume based indicators. When I create a new indicator and use the following code:

if (Volume[0] >= Volume[1] * 1.10)
DrawDiamond("Volume Spike" + CurrentBar, 0, Low[0] - TickSize, Color.Red);

it compiles fine but when I apply it nothing shows up on the screen and I get the following error message in the log:

Error on calling the 'OnBarUpdate' method for indicator 'AAATest' on bar 0: Index was out of range. Must be non-negative and less than the size of the collection.

Any ideas on what the problem might be? I am running 6.0.1000.9.

Thanks

[NinjaTrader_Ray]

The following tip will answer your question -

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

[TiP2012]

The devil is in the detail Thanks for the incredibly fast answer.....