Error on calling 'OnBarUpdate' method on bar 0

[altij]

Hi,
I'm having an error saying that i'm accessing a bar that is out of range. I don't get it since I only use current index 0.

"Indicator 'VWAR': Error on calling 'OnBarUpdate' 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.
"


Here is the code (the problem is when a call the vwap[0], because when I take it out it works)


1st indicator not working but the second is working and both call vwap[0],

1st

protected override void OnStateChange()
{
if (State == State.SetDefaults)
{
Description = @"Volume Weighted Average Range";
Name = "VWAR";
Calculate = Calculate.OnBarClose;
IsOverlay = true;
DisplayInDataBox = true;
DrawOnPricePanel = true;
DrawHorizontalGridLines = true;
DrawVerticalGridLines = true;
PaintPriceMarkers = true;
ScaleJustification = NinjaTrader.Gui.Chart.ScaleJustification.Right;
//Disable this property if your indicator requires custom values that cumulate with each new market data event.
//See Help Guide for additional information.
IsSuspendedWhileInactive = true;
AddPlot(Brushes.Purple, "PlotVWAR");
}
else if (State == State.DataLoaded)
{
vwap = new VWAP8();
}
}

protected override void OnBarUpdate()
{

if (Bars.IsFirstBarOfSession)
{
iCumVolume = VOL()[0];
iCumVolumeRange = VOL()[0] * (High[0] - Low[0]);
}
else
{
iCumVolume = iCumVolume + VOL()[0];
iCumVolumeRange = (iCumVolumeRange + (VOL()[0] *(High[0] - Low[0]))) ;
}

PlotVWAR[0] = (iCumVolumeRange / iCumVolume) + vwap[0] ;

}

2nd script working no problem

else if (State == State.DataLoaded)
{
vwap = VWAP8();
stdDev1 = StdDev(vwap,Period);

}


}

protected override void OnBarUpdate()
{

PlotVWAP[0] = vwap[0];
MinusVAR1[0] = vwap[0] - NumStdDev * stdDev1[0];
MinusVAR2[0] = vwap[0] - 2 *NumStdDev * stdDev1[0];
MinusVAR3[0] = vwap[0] - 3 * NumStdDev * stdDev1[0];
PlusVAR1[0] = vwap[0] + NumStdDev * stdDev1[0];
PlusVAR2[0] = vwap[0] + 2 * NumStdDev * stdDev1[0];
PlusVAR3[0] = vwap[0] + 3 * NumStdDev * stdDev1[0];


Thanks

[s.kinra]

Hello altij,
Correct way to call indicator is below:-

1. Before State change : private VWAP8 vwap;
2. State.DataLoaded : vwap = VWAP8();
3. OnBarUpdate :

PlotVWAP[0] = vwap[0];
MinusVAR1[0] = vwap[0] - NumStdDev * stdDev1[0];
MinusVAR2[0] = vwap[0] - 2 *NumStdDev * stdDev1[0];
MinusVAR3[0] = vwap[0] - 3 * NumStdDev * stdDev1[0];
PlusVAR1[0] = vwap[0] + NumStdDev * stdDev1[0];
PlusVAR2[0] = vwap[0] + 2 * NumStdDev * stdDev1[0];
PlusVAR3[0] = vwap[0] + 3 * NumStdDev * stdDev1[0];

Be sure to define all plots & variables.
For other query, if you wish to have VWAP with Range, open VWAP8 in NinjaScript editor - > right click -> save as new name. Now you can replace (High[0] + Low[0] + Close[0]) / 3) with (High[0] - Low[0]), you're done now go ahead & compile it.
Hope it helps!

[NinjaTrader_PaulH]

Hello altij,

Thanks for your post and welcome to the NinjaTrader forums!

The difference between the two sections is that in the first you are using vwap = new VWAP8(); and in the 2nd you are using vwap = VWAP8(); the difference being the use of the "new" keyword which is not needed as you are creating a private instance of the existing VWAP8 indicator.

[altij]

Thank you. A peer review was needed.
Thank you very much