Object reference not set to an instance of an object

[jh1962]

I am testing a new strategy. It backtests fine, but when I attempt to click on any tab other than Summary, NT crashes and the following is posted to the trace file:

2009-09-10 10:43:38:890 in OnUnhandledThreadException
2009-09-10 10:43:38:890 ********* exception trapped *********
2009-09-10 10:43:38:890 Object reference not set to an instance of an object.
2009-09-10 10:43:38:890 at NinjaTrader.Strategy.StrategyBase.AddAllExecutions (Position position, Execution execution, Order order, Boolean setExitEntry, Boolean setStopLoss, Boolean pooled)
at NinjaTrader.Gui.PerformanceViewerControl.RunBackTe st()
at NinjaTrader.Gui.PerformanceViewerControl.Display()
at NinjaTrader.Gui.PerformanceViewerControl.OnTabSele cted(Object sender, EventArgs e)
at System.EventHandler.Invoke(Object sender, EventArgs e)
at System.Windows.Forms.TabControl.OnSelectedIndexCha nged(EventArgs e)
at System.Windows.Forms.TabControl.WmSelChange()
at System.Windows.Forms.TabControl.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.O nMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.W ndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)



What am I doing wrong?

[NinjaTrader_JoshP]

jh1962,

Would not know without code. I suggest you try to strip down your code to its basics. See if that works. Then slowly layer on complexity till you find the segment that breaks. Then we can help you analyze why such a code segment would cause this.

[jh1962]

Hi,

Thanks for the quick response. The code is exceedingly simple. And as I said, the problem isn't that the backtest doesn't run - it does. But when I click on any tab other than "Summary", it crashes. I get a full summary, but I cannot look at trades, executions, charts, graphs, etc.

Ideas?

[NinjaTrader_JoshP]

Please try with SampleMACrossOver strategy and see if the same happens.

[jh1962]

Sample works fine. I commented out everything until the problem went away. Had to restart NT each and every time. This is apparently the line causing the problem:

Add("ZB 09-09", PeriodType.Minute, 10);

Advice?

That line is (was) in the Initialize() method

[NinjaTrader_JoshP]

So a simple strategy with no logic in OnBarUpdate() with only that line in Initialize() causes you the crash? What version of NT are you on? Can you pull up a chart of this instrument with no problem?

[r2kTrader]

Josh,

I am hitting this problem as well with NT7. I will do more homework to confirm. Just came across this.