strategy - not working for all instruments

[tonynt]

Hello,

I have finished my strategies after a long work and with your support.
Now it occurs that when I do enabling a strategy for EURUSD, GBPUSD and AUDUSD in the strategy tab the AUDUSD is unchecked from NT immediately. How can this be that a strategy can be enabled for 2 currencies and not for a 3rd one? I have not idea what might be the reason for this.

Thanks
Tony

[NinjaTrader_RyanM1]

Hi Tony,

Are there any error messages in log tab of the control center?

[tonynt]

Hello Ryan

in the logtab there appears:

"Error on calling OnExecution method for strategy.... Object reference not set to an instance of an object."

In the strategy I have:
protected override void OnExecution(IExecution execution)
{ if (execution.Order.OrderState == OrderState.Filled && (execution.Order.Name == "S1A" ))
tradeCounter++;

}

Do I have to add something in the variables section (tradeCounter I have) or with Ordername?

But why can I enable the same strategy for EURUSD but with AUDUSD the message appears?

Thanks
Tony

[NinjaTrader_RyanM1]

Each strategy instance is unique, so there are no assurances that if one instance works without errors then all instances work without errors. Each could produce a different sequence of events.

Please see this link for checking null references, which can help with the type of error you are getting with your strategy:

http://www.ninjatrader.com/support/forum/showthread.php?t=4226

[tonynt]

Ryan,

thank you for the link. Can you please shortly type in what there is to do so for

protected override void OnExecution(IExecution execution)
{ if (execution.Order.OrderState == OrderState.Filled && (execution.Order.Name == "S1A" ))
tradeCounter++;}

I don´t understand as this is not in OnBarUpdate as in the sample.

THANK YOU!

Each strategy instance is unique, so there are no assurances that if one instance works without errors then all instances work without errors. Each could produce a different sequence of events.

Please see this link for checking null references, which can help with the type of error you are getting with your strategy:
http://www.ninjatrader.com/support/f...ead.php?t=4226

[NinjaTrader_RyanM1]

Unfortunately we could not debug this for you. It could be anywhere you access an object that does not exist. The debugging tool to use for these cases is try catch. This sample can help:

http://www.ninjatrader.com/support/forum/showthread.php?t=9825