MissingMethodException error while trying to play animation when GameObject is destroyed

I've been working on a script based on picking up items in order to proceed next scene and I also wanted to make a short GUI animation once my object is destroyed (Removed from the Hierarchy) but every time my item is destroy, I get this error:

MissingMethodException: UnityEngine.AnimationClip.Play at Boo.Lang.Runtime.DynamicDispatching.MethodDispatcherFactory.ProduceExtensionDispatcher () [0x00000] in :0

Here's the script: (Attached to the player's Camera)

 var hasKey = false;
 var AnimationClip : AnimationClip;
 
 function Update() {
     if (Input.GetKeyDown(KeyCode.E)){
         Debug.Log("Pressed");
         var hit : RaycastHit;
         if (Physics.Raycast (transform.position, transform.forward, hit, 100)) { // Sends out a raycast to check if something is in front of you
             Debug.Log("hit Something " + hit.transform.name);
             if (hit.transform.name.Equals("Key")){ // If the object in front of you has the tag Key
                 hasKey = true;
                 Destroy(hit.transform.root.gameObject); //Destroy Key Object
                 Debug.Log("About to play key animation");
                 AnimationClip.Play(AnimationClip);
             } else if(hit.transform.name.Equals("Door")) {  //Checks if the gameobject you're looking at has the tag Door
                 if(hasKey) {
                     Debug.Log("HasKey");
                     hit.transform.SendMessage("Unlock"); //Calls the function Unlock on the door
                 }
             }
         }
     }
 }

I've tried many attempts to fix this, it's just complicated...

If you guys have a good way to solve this problem, post your answers below! I will appreciate your help :D

Thanks!