Error OnBarUpdate for strategy

[eurostoxx trader]

Hi,

I am trying to make a simple strategy that prints out some values, though using multiple time frames. I keep getting the following error

Error on calling 'OnBarUpdate' method for strategy 'PrintSwing/b122f02ce1144ea8be09dba0c60f5631': You are accessing an index with a value that is invalid since its out of range. I.E. accessing a series [barsAgo] with a value of 5 when there are only 4 bars on the chart.


Any idea why?

Here is the first few lines of code in my strategy

protected override void Initialize()
{
Add(Swing(5)); //add swing indicator with strength of 5, not 5minutes!
Add(PeriodType.Minute, 30); //add second time frame, 30mis
Add(PeriodType.Minute, 1); // add a third timeframe, 1min
Add(EMA(20));
Add(VWAP());
//assumes that the initial time period chosen for strategy is 1min
CalculateOnBarClose = true;
}
/// <summary>
/// Called on each bar update event (incoming tick)
/// </summary>
protected override void OnBarUpdate()
{ // opening bracket
// code for calculating fibonacci levels on the opening range 9:30am - 10:30
double opening_high = 0;
double opening_low = 0;
// Resets the highest high and lowest low at the start of every new session
 
if (Bars.FirstBarOfSession && FirstTickOfBar)
{ 
opening_high = 0;
opening_low = 0;
}
 
DateTime startTime;
DateTime endTime;
endTime = new DateTime(Time[0].Year, Time[0].Month, Time[0].Day, 10, 30, 0);
startTime = new DateTime(9,30,0);
int startBarsAgo = GetBar(startTime);
int endBarsAgo = GetBar(endTime);
 
//calculates opening range high and low
opening_high = MAX(High, startBarsAgo - endBarsAgo)[endBarsAgo];
opening_low = MIN(Low, startBarsAgo - endBarsAgo)[endBarsAgo];
 
//fib level calculations on opening range
 
double opening_range_fibo_thirty = opening_low + (opening_high - opening_low) * .382;
double opening_range_fibo_sixty = opening_low + (opening_high - opening_low) * .618;
double opening_range_fibo_fifty = opening_low + (opening_high - opening_low) * .5; 
double opening_range_fibo_thirty_extension_high = opening_low + (opening_high - opening_low) * 1.382; 
double opening_range_fibo_thirty_extension_low = opening_low - (opening_high - opening_low) * 1.382; 

[NinjaTrader_Tim]

Hi eurostoxx trader,

I would start by doing a CurrentBar check for all your series, something like...

if (CurrentBarArray[0] > 0 && CurrentBarArray[1] > 0 && CurrentBarArray[2] > 0)
{
all your code here
}

Then, use try/catch blocks to find the offending line.
More info at - http://www.ninjatrader.com/support/f...ead.php?t=9825