Draw.Rectangle object reference not set to an instance not set

[maltese]

Hi,

I'm getting the error message "Indicator '': Error on calling 'OnBarUpdate' method on bar 135: Object reference not set to an instance of an object." on the below code:

Draw.Rectangle(this, "OpeningRange", false, 225, orHigh, 0, orLow, Brushes.Transparent, Brushes.Firebrick, 20);

I'm not quite sure why this keeps happening.

[NinjaTrader_PaulH]

Hello maltese,

Thanks for your post.

At the time that the Draw.rectangle is executing it may be that only 135 bars have been loaded and it appears that you are trying to reference a start bars ago of 225. You would need to check that at least 225 bars have loaded before trying to execute the Draw.

You can check how many bars by looking at the value of CurrentBar. For example:

if (CurrentBar > 225)
Draw.Rectangle(this, "OpeningRange", false, 225, orHigh, 0, orLow, Brushes.Transparent, Brushes.Firebrick, 20);

Reference: https://ninjatrader.com/support/help...currentbar.htm

[maltese]

Hello maltese,

Thanks for your post.

At the time that the Draw.rectangle is executing it may be that only 135 bars have been loaded and it appears that you are trying to reference a start bars ago of 225. You would need to check that at least 225 bars have loaded before trying to execute the Draw.

You can check how many bars by looking at the value of CurrentBar. For example:

if (CurrentBar > 225)
Draw.Rectangle(this, "OpeningRange", false, 225, orHigh, 0, orLow, Brushes.Transparent, Brushes.Firebrick, 20);

Reference: https://ninjatrader.com/support/help...currentbar.htm

Thanks but I tried that. The referenced code is actually in a multi-timeframe instrument and it appears that Draw.Rectangle bombs when it tries to reference a lookback greater than 256 bars even if I add the code you mentioned.

[NinjaTrader_PaulH]

Hello maltese,

Thanks for clarifying that you are using an MTF Ninjascript. In that case I recommend that you review the following sections of the helpguide and would advise to use CurrentBars instead of CurrentBar after reviewing the MTF section of the helpguide. https://ninjatrader.com/support/help...nstruments.htm

Also, if your script has added any series<t> you may need to set the lookback period to MaximumBarsLookBack.Infinite as the default is 256. Reference: https://ninjatrader.com/support/help...rslookback.htm Note this can also set in the parameters of the applied Ninjascript.

[maltese]

Thanks I fixed it.