[SOLVED]I can't use Select() on my Buttons in scripts

Hi
i'm working on a menu using xbox controller

I want to select a <Button> object in a script, but get an error i can't solve

First i made a public list of buttons that i dragged and dropped in the inspector

Code (CSharp):

1. public List<Button> ButtonTab;
2. private int idNav;

Then later when i tryed to do this :

Code (CSharp):

1. ButtonTab [idNav].Select ();

i got the error :

NullReferenceException: Object reference not set to an instance of an object
UnityEngine.UI.Selectable.Select () (at C:/BuildAgent/work/d63dfc6385190b60/Extensions/guisystem/guisystem/UI/Core/Selectable.cs:612)
MenuController.Update () (at Assets/Script/MenuController.cs:43)

If you have an idea or if you know a better way to highlight my current button it would be amazing <3

 

Ok i figured out.

You know the EventSystem thing which appears when you create a canvas ? well don't delete it >< i had it hiden in a hierarchy that i diseabled and so it couldn't work. I feel stupid. Slap me.

 

I've been trying to figure this out for a week now. And finally, you gave me the solution! You're a hero, man!