Had this error in the past

[JerryWar]

If I increase the number of Days back in the data series using the U.I.
I get this error randomly.

2017-07-13 10:38:46:076|3|16|Indicator 'TrpScrnVollbl': Error on calling 'SetState' method: Object reference not set to an instance of an object.
of course the indicator does not run.

So I then Reload NinjaScript and everything is then fine with the new Days back setting.

Ver 8.0.7

[NinjaTrader_PatrickH]

Hello JerryWar,

Thank you for your post.

In the TrpScrnVollbl indicator are you add any additional data series in the Configure state?

Do you try to use any dynamic BarsPeriod items such as BarsPeriodType or Value in the AddDataSeries()?

Do you set the barsToLoad overload for the AddDataSeries() call?

I look forward to your response.

[JerryWar]

1) Yes
2) BarsPeriodType.Volume
3) No

One thing I should add is, Previously I do not believe the error message indicated which indicator was generating the error.

[JerryWar]

Am I better off just using AddDataSeries( int period). I assume it will default to the Root data series
BarsPeriod Type.

[JerryWar]

I changed the addDataSeries from

AddDataSeries(BarsPeriodType.Volume, 343 )
to:
AddDataSeries(new BarsPeriod { BarsPeriodType = BarsPeriodType.Volume, Value = 343 });

I have gone back n forth on several charts that use it modifying the DaysBack and it seems like it is not generating the error anymore although I will have to wait to see. It is sometimes very random.

[NinjaTrader_PatrickH]

Hello JerryWar,

Thank you for your patience.

May I test the indicator on my end?
You can send the indicator to platformsupport[at]ninjatrader[dot]com with 'ATTN: Patrick H' in the subject line and a reference to this thread in the body of the email.

You can export your indicator by going to Tools > Export > NinjaScript Add On > Add > select your indicator > OK > Export > name the file 'NTsupport' > Save.

The file will be located under Documents\NinjaTrader 8\bin\Custom\ExportNinjaScript. Please attach the file to your response.

I look forward to your response.

[JerryWar]

Sorry, I can't do that.

[JerryWar]

Patrick
I had several crashes during the past week ( Not bad from my view). They were all from changing theDaysBack setting in the DataSeries U.I. So while I am trading I don't monkey around with the setting. However, One thing stuck out, They all occurred when reducing the daysBack. On the last one I went to my taskschedular to kill Ninja and I noticed that the Memory was just under 1 gig just about double what it is normally. I am wondering if there is something in changing that U.I setting that could cause a memory leakage. I would think when I reduced the DaysBack it should be recovering unused memory that was needed with Longer lookback.
Just a thought.

[NinjaTrader_PatrickH]

Hello JerryWar,

Thank you for your feedback.

Based on solely an option like the Days To Load or Bars To Load in the Data Series menu, then yes, generally speaking this should not increase memory. However, changing this in code or if your NinjaScript files now need to re-calculate there is no guarantee .NET will release the memory right way. In fact the garbage collector can generally only be guaranteed to run when shutting down the application.

Please let me know if you have any questions.