object reference not set to an instance of an object

[eleven]

Hello,

I need some help. I am using a strategy with "ES 12-19" as a primary instrument with which I want to place a trade on the MES 12-19 contract. I've added the following code to my strategy.

            if (State == State.Configure)
            {
                AddDataSeries("MES 12-19");
            }

When I backtest my strategy, I get the following error.

object reference not set to an instance of an object

Please advise to what, I'm doing wrong.

Thanks,
eleven

[NinjaTrader_PaulH]

Hello eleven,

Thanks for your post.

The error is advising that something you are accessing has not been created at the time you are accessing it. There is no specific thing I can advise as to the source of the error.

To determine what the source of the error is you will need to debug your strategy. This is typically done with print statements added to your code to send a print output to the New>Ninjascript Output window. As you do not know where the error is, you would add a print statement every few lines of code and then observe the output window when you apply the strategy. The last print statement value shown in the output window would indicate the error occurs after that print statement, you can then add further print statements to zero in on the offending code.

Here is a link to our tips on debugging: https://ninjatrader.com/support/help...script_cod.htm

If you are not familiar with creating multi series coding, we highly recommend a review of https://ninjatrader.com/support/help...nstruments.htm

[eleven]

Thanks Paul, I figured out the issue I was having with object reference not set to an instance of an object, but I have another question.

I'd like to use ES historical data to place orders on MES. MES is a new instrument so the data only goes back a few months. Is there a way to set up a strategy using ES as the primary instrument, but place trades on MES using the full historical data of ES.

Bottom line is that my strategy places different trades on ES and MES. I believe it due to the lack of historical MES data as I require over 100 bars with my strategy.

Thanks,
eleven

[NinjaTrader_PaulH]

Hello eleven,

Thanks for your post.

It is possible to create a strategy that places orders on more than one instrument or using calculatons on one instrument and entering on another instrument.. I recommend a thorough review of this specific section of the help guide that reveals all of the consideratiuons required for such a strategy: https://ninjatrader.com/support/help...nstruments.htm

Please note that you would not be able to place orders on MES prior to its first day of trading.

[DTSSTS]

Hello eleven,

Thanks for your post.

The error is advising that something you are accessing has not been created at the time you are accessing it. There is no specific thing I can advise as to the source of the error.

To determine what the source of the error is you will need to debug your strategy. This is typically done with print statements added to your code to send a print output to the New>Ninjascript Output window. As you do not know where the error is, you would add a print statement every few lines of code and then observe the output window when you apply the strategy. The last print statement value shown in the output window would indicate the error occurs after that print statement, you can then add further print statements to zero in on the offending code.

Here is a link to our tips on debugging: https://ninjatrader.com/support/help...script_cod.htm

If you are not familiar with creating multi series coding, we highly recommend a review of https://ninjatrader.com/support/help...nstruments.htm

What you posted here about adding a print statement EVERY FEW LINES is great. First time I have seen that in 3 years with NinjaTrader. Believe me I have been instructed to add Print Statements over 40 times

This should be stated more often from support

[hothomas]

I keep getting this error when I NT asks me if I want to roll over futures contracts and I say yes by checking the boxes next to the instruments I want to update. Every single time I get this error and then a popup that says "NT has stopped working" . So it crashes everytime. This has been going on for months.

[hothomas]

https://www.screencast.com/t/IAvpr9BXs6K7

Watch this video

[NinjaTrader_PaulH]

Hello hothomas,

Thanks for your post.

In your NinjaTrader, please go to Help>Email support.

In the email support window, add your e-mail address, and in the large section describe the issue there. This will automatically send in your log and trace files which will allow the platform support team to review and advise.

Note: do not post log and trace files here due to the sensitive nature of these files.