The name animator does not exist in the current context... Help?

Ok, so I have this code that's setup to change the parameter in my animator controller from 0 to 1 when the W key is pushed down. This is the code I have:

using UnityEngine; using System.Collections;

public class NewBehaviourScript : MonoBehaviour {

 // Use this for initialization
 void Start () {

     animator = GetComponent<Animator>();    
 }
 
 // Update is called once per frame
 void Update () {
     if (Input.GetKeyDown(KeyCode.W))
     { 
         animator.SetFloat ("Forward", 1);
     }
 }
 

}

But the problem is that it has errors that say that the keyword animator isn't recognized... Here's an image to show exactly what I mean.