The params of my strategy dont change

[ninjo]

Hello,

Its happening an strange thing in my strategy.

When I try to change the value of params on the Strategies window, the params only change 1 time. From the second time it does not work anymore and Output show:

"Error on calling 'OnStateChange' method: Object reference not set to an instance of an object."



I declare my var:

public double myVar{ get; set; }

and set:

if (State == State.SetDefaults)
{
myVar = 1.5;
}


What do you think is happening? I dont have this errors with other strategies with the same params : /

[NinjaTrader_ChelseaB]

Hello ninjo,

My thoughts would be that this is not the code causing the error.

Attached is an export of a test script with this code added.

Are you able to reproduce using this test script?


Providing a reduced script that can demonstrate the behavior with all other code removed, is very helpful to demonstrate an issue.

As a tip, to export a NinjaTrader 8 NinjaScript so this can be shared and imported by the recipient do the following:

1. Click Tools -> Export -> NinjaScript...
2. Click the 'add' link -> check the box(es) for the script(s) and reference(s) you want to include
3. Click the 'Export' button
4. Enter a unique name for the file in the value for 'File name:'
5. Choose a save location -> click Save
6. Click OK to clear the export location message

By default your exported file will be in the following location:

• (My) Documents/NinjaTrader 8/bin/Custom/ExportNinjaScript/<export_file_name.zip>

Below is a link to the help guide on Exporting NinjaScripts.

http://ninjatrader.com/support/helpGuides/nt8/en-us/export.htm

[ninjo]

Hello Chelsea,

I solved the problem when I was reduced the script to find the error.

The problem was that I declared some other vars in "State.Configure". The problem solved when I declared it in "State.Loaded" instead

Thank you.

[NinjaTrader_ChelseaB]

Hello ninjo,

Variables should be declared within the scope of the class not within a method.
They should be assigned in a method.