Using a Timer on Second Bar Series - Startup Errors

[dontpanic]

Hi,

I'm using a timer to trigger an event that displays 5 minute volume on my range chart, and I am getting errors in my trace log on startup (below)

I am fairly sure that I have the timer events setup correctly, its probably what I am doing in the timer event that is the problem. The timer and the events are created in OnStartup() and in my Initialize() I do this -

Add(PeriodType.Minute, 5);
volTimer.Start();

In the timer event I refer to the array VOL(BarsArray[1])[0] which I suspect is the cause of the error, as if the array is not created before the first timer event is triggered?

Do I need to check the array size or something else first?

Thanks,
Will.

Error Log
--------------

at NinjaTrader.Data.DataSeries.get_Item(Int32 barsAgo)
at NinjaTrader.Indicator.IndicatorBase.get_Item(Int32 barsAgo)
at NinjaTrader.Indicator.Wills5MinuteVolume.displayVo lume()
at System.Windows.Forms.Timer.OnTick(EventArgs e)
at System.Windows.Forms.Timer.TimerNativeWindow.WndPr oc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
2014-03-31 19:08:43:625 in OnUnhandledThreadException
2014-03-31 19:08:43:625 *************** unhandled exception trapped ***************
2014-03-31 19:08:43:625 Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
2014-03-31 19:08:43:625 at System.Collections.ArrayList.get_Item(Int32 index)
at NinjaTrader.Data.DataSeries.get_Item(Int32 barsAgo)
at NinjaTrader.Indicator.IndicatorBase.get_Item(Int32 barsAgo)
at NinjaTrader.Indicator.Wills5MinuteVolume.displayVo lume()
at System.Windows.Forms.Timer.OnTick(EventArgs e)
at System.Windows.Forms.Timer.TimerNativeWindow.WndPr oc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

[NinjaTrader_Bertrand]

Will, would the outcome change if you're not starting the timer in Initialize() but OnStartUp(), so after the bars array is added and ready?

[dontpanic]

No, Bertrand, unfortunately.

That was where I had it originally and that seems to be worse. It doesnt seem to happen on every chart, but when its in OnStartup() it seems to happen more.

Either way, its still happening.

Thanks...

[NinjaTrader_Bertrand]

Hi Will with Initialize() getting called multiple times I would not start the timer there. You update the volume with the timer for realtime only, correct? Would you mind sending me the script to support at ninjatrader dot com so I could give this a quick run here?

[dontpanic]

Yes, no problem, I will do that shortly.

[dontpanic]

Hi, Its sent now,
Thanks,
Will.