Why this error with adxvma indicator

[Sangui]

I am trying to add the ADXVMA indicator to play a little in my code but there is a problem.

The code is:

protected override void OnBarUpdate()
{

if(CurrentBar<20) return;

Plot0[0]=(Close[0]-ADXVMA(10)[0]);


}

And when adding the indicator to the chart, there is not any plot and the log says:
"Error on calling 'OnBarUpdate' method on bar 20: Object reference not set to an instance of an object"

The ADXVMA indicator works fine when I insert it in the chart manually.

[NinjaTrader_PaulH]

Hello Sangui,

Thanks for your post.

I see the same thing here. As this is not a NinjaTrader provided indicator I would suggest you contact the indicators author for assistance. You can private message them by clicking on their name in the download section where the indicator is posted.