BCE0019 "enabled" is not a member of "Object"(On JavaScript Script)

Basically, I am making a psychology game and I want to make it so you can’t collide with an object ahead of you until you collide with one before it. Therefore I want to turn off MeshCollider so they won’t be able to collide before I want them to.

I am getting this Error:
Assets/Objectives/Objective1.js(17,21): BCE0019: ‘enabled’ is not a member of ‘Object’.

#pragma strict

private var objManager : ObjectiveManager;
var ob2;

function Start()
{
    objManager = GameObject.Find("3rdPersonController").GetComponent(ObjectiveManager);
    ob2 = GameObject.Find("Objective2").GetComponent(MeshCollider).enabled;

}

function OnTriggerEnter (Col : Collider)
{
    if(Col.tag == "Player")
        {
        	ob2.enabled = true;
            Destroy(gameObject);
            objManager.objective1 = true;
            objManager.objective2 = false;
            objManager.objective3 = false;
            objManager.objective4 = false;
            objManager.objective5 = false;
            objManager.objective6 = false;
            objManager.objective7 = false;
            objManager.objective8 = false;
            objManager.objective9 = false;
            objManager.objective10 = false;
            objManager.objective11 = false;
            objManager.objective12 = false;

        
        }
}

The “Objective2” is an object in my scene which I want to be turned on after the collision

var ob2 : MeshCollider; //shouldn’t it be this?

Nevermind FIXED:
#pragma strict

private var objManager : ObjectiveManager;
private var ob3 : MeshCollider;

function Start()
{
    objManager = GameObject.Find("3rdPersonController").GetComponent(ObjectiveManager);
     ob3 = GameObject.Find("Objective3").GetComponent(MeshCollider);
}

function OnTriggerEnter (Col : Collider)
{
    if(Col.tag == "Player")
        {
        	ob3.enabled = true;
            Destroy(gameObject);
            objManager.objective1 = false;
            objManager.objective2 = true;
            objManager.objective3 = false;
            objManager.objective4 = false;
            objManager.objective5 = false;
            objManager.objective6 = false;
            objManager.objective7 = false;
            objManager.objective8 = false;
            objManager.objective9 = false;
            objManager.objective10 = false;
            objManager.objective11 = false;
            objManager.objective12 = false;
        
        }
}