Optimization. 'Instrument.' -> Object reference not set to an instance of an object.

[webus]

Hi,

So, I'm trying to add a 'HeikenAshi' DS using 'AddHeikenAshi()' function. Everything works OK in 'Kinetick', 'Playback' and 'StrategyAnalyzer'. However, it doesn't work in Optimizer. Accessing to 'Instrument' returns 'Error on calling 'OnStateChange' method: Object reference not set to an instance of an object.'. Why? What the issue? How can I solve it?
Here is the exact code:

else if (State == State.Configure){
    IncludeTradeHistoryInBacktest    = true;
    AddDataSeries(BarsPeriodType.Tick,1);
    AddHeikenAshi(
                    Instrument.FullName,
                    GetBarsPeriodType(pmDsType_DsPeriodType),
                    pmDsType_DsPeriod,
                    BarsPeriod.MarketDataType
    );
    AddDataSeries(
                    GetBarsPeriodType(pmDsType_DsPeriodType),
                    pmDsType_DsPeriod
    );
}
​​

[NinjaTrader_ChelseaB]

Hello webus,

This is violating the rules of AdDataSeries() (or any other add series method).

From the help guide:
"Arguments supplied to AddDataSeries() should be hardcoded and NOT dependent on run-time variables which cannot be reliably obtained during State.Configure (e.g., Instrument, Bars, or user input). Attempting to add a data series dynamically is NOT guaranteed and therefore should be avoided. Trying to load bars dynamically may result in an error similar to: Unable to load bars series. Your NinjaScript may be trying to use an additional data series dynamically in an unsupported manner."

https://ninjatrader.com/support/helpGuides/nt8/adddataseries.htm

You must hard code the values used in AddDataSeries() and AddHeikenAshi() and you cannot use variables.

[QuantKey_Bruce]

Instead of putting Instrument.FullName there, try null.

[NinjaTrader_ChelseaB]

Hello,

null can be used for the instrument, which will use the primary instrument.

"Tips
4. For the instrument name parameter null could be passed in, resulting in the primary data series instrument being used."

https://ninjatrader.com/support/helpGuides/nt8/adddataseries.htm

However, the pmDsType_DsPeriodType and pmDsType_DsPeriod will have to be removed and hard coded values used instead.