The referenced script on this Behaviour (Game Object 'Player') is missing!

private Animator playerAnimator;
private float moveHorizontal;
private float moveVertical;
private Vector3 movement;

// Use this for initialization
void Start () {
    playerAnimator = GetComponent<Animator> ();
}

// Update is called once per frame
void Update () {
    moveHorizontal = Input.GetAxisRaw ("Horizontal");
    moveVertical = Input.GetAxisRaw ("Vertical");

    movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);
}

void FixedUpdate () {
    if (movement != Vector3.zero) {
        playerAnimator.SetFloat ("speed", 3f);
    } else {
        playerAnimator.SetFloat ("speed", 0f);
    }
}