ChangableLookAt

Hey. I'm working on a LookAt camera script that changes when you click on a specific type of object. (In this case a game bal.) I'm having trouble figuring out Tags. When I set one in the editor, it becomes an Invalid Tag. I think I'm missing something.

Code (csharp):

1.  
2. using UnityEngine;
3. using System.Collections;
4.  
5. public class ChangableLookAt : MonoBehaviour
6. {
7.     public Transform lookAt;
8.     public float smooth = 5F;
9.  
10.     Quaternion lastRotation;
11.     Quaternion goalRotation;
12.  
13.     void FixedUpdate ()
14.     {
15.         if (lookAt != null)
16.         {
17.             Debug.DrawLine(lookAt.position, transform.position, Color.gray);
18.  
19.             Vector3 difference = lookAt.position - transform.position;
20.             Quaternion rotation = Quaternion.LookRotation(difference, Vector3.up);
21.             goalRotation = rotation;
22.         }
23.     }
24.  
25.     void Update ()
26.     {
27.         if (Input.GetMouseButtonDown(0))
28.         {
29.             Ray ray = camera.ScreenPointToRay (Input.mousePosition);
30.            
31.             RayCollision coll = Dynamics.CastRay (transform.position, ray.direction);
32.            
33.             if (coll != null)
34.             {
35.                 GOComponent goc = (GOComponent) coll.collider;
36.                
37.                 if (goc.CompareTag("Selectable"))
38.                 {
39.                     lookAt = goc.transform;
40.                 }
41.             }
42.         }
43.     }
44.  
45.     void Awake ()
46.     {
47.         lastRotation = transform.rotation;
48.         goalRotation = lastRotation;
49.     }  
50.    
51.     void LateUpdate ()
52.     {
53.         lastRotation = Quaternion.Slerp (lastRotation, goalRotation, smooth * Time.deltaTime);
54.         transform.rotation = lastRotation;
55.     }
56. }
57.  

-Jon