Problem accessing member of the Slider class

Hi guys, I keep getting an error while trying to access a member of the Slider class.
Here’s how I’m accessing the member:

import UnityEngine.UI;

var SliderObject : GameObject;
var Societa : GameObject;

function Start () {

}

function Update () {
SliderObject.GetComponent.().value = Societa.GetComponent.().position.y * 100;
}

Am I doing something wrong? Thank you.

I forgot to report the error :

“Value is not a member of Slider”.