Crash with wizard built strategy

[zoltran]

Get the following error on the strategy below
This is a 100% wizard built strategy

-----------------------------------
See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.Exception: 'Positions' property can not be accessed from within 'Initialize' method
at NinjaTrader.Strategy.StrategyBase.get_Positions()
at NinjaTrader.Strategy.StrategyBase.SetInput(Bars[] bars)
at NinjaTrader.Gui.Chart.ChartControl.Add(StrategyBas e strategyTemplate)
at NinjaTrader.Gui.Chart.ChartStrategies.Apply()
at NinjaTrader.Gui.Chart.ChartStrategies.OnOkButtonCl ick(Object sender, EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventAr gs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message&amp ; m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message&am p; m)
at System.Windows.Forms.Button.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)

=======================

public class Mama : Strategy
 {
 #region Variables
 // Wizard generated variables
 // User defined variables (add any user defined variables below)
 #endregion

 /// <summary>
 /// This method is used to configure the strategy and is called once before any strategy method is called.
 /// </summary>
 protected override void Initialize()
 {
 Add(MAMA(0.5, 0.05));
 SetStopLoss("", CalculationMode.Price, VMA(8, 8)[0], false);

 CalculateOnBarClose = false;
 }

 /// <summary>
 /// Called on each bar update event (incoming tick)
 /// </summary>
 protected override void OnBarUpdate()
 {
 // Condition set 1
 if (CrossAbove(MAMA(0.5, 0.05), MAMA(0.5, 0.05).Fama, 1)
 && CCI(14)[0] > 100)
 {
 Alert("MamaL", Priority.High, "", "", 60, Color.Lime, Color.Black);
 EnterLong(DefaultQuantity, "MamaL");
 SendMail("Ninja", "[email protected]", "MamaL", "");
 }

 // Condition set 2
 if (CrossBelow(MAMA(0.5, 0.05), MAMA(0.5, 0.05).Fama, 1)
 && CCI(14)[0] < -100)
 {
 Alert("MamaS", Priority.High, "Short", "", 60, Color.Red, Color.Black);
 EnterShort(DefaultQuantity, "MamaS");
 SendMail("Ninja", "[email protected]", "MamaS", "");
 }



 // Condition set 5
 if (Low[0] < MAMA(0.5, 0.05).Fama[0]
 && Position.MarketPosition == MarketPosition.Long)
 {
 ExitLong("XL1", "");
 }

 // Condition set 6
 if (High[0] > MAMA(0.5, 0.05).Fama[0]
 && Position.MarketPosition == MarketPosition.Short)
 {
 EnterShort(DefaultQuantity, "XS1");
 }
 }

 #region Properties
 #endregion
 }
}

[NinjaTrader_Dierk]

imported post

There are several issues related to that problem. We need to think a bit how to resolve at best.

We'll keep you posted.

[NinjaTrader_Dierk]

imported post

Here is the deal:
- you can not have indicator values like VMA(8, 8)[0] for the stop target settings in the Initialize method. The wizard in the next release will prevent you doing that.
- however in no event NT should crash. Next release will hold a fix which would trap a situation like the above.
- if you want to have indicator values in your stop/target settings then you need to switch from wizard to manual mode and move the line

SetStopLoss("", CalculationMode.Price, VMA(8, 8)[0], false);

to the OnBarUpdate method.

Hope this helps. Thanks for bringing that up.