Frog animation fine but it does not move. Obsolete assets?

void FixedUpdate () {
        //calculates physics
        // if the player's movement vector does not equal zero.....
        if (movement != Vector3.zero) {
            // then create a target location based on the movement vector
            Quaternion targetRotation = Quaternion.LookRotation (movement, Vector3.up);
            // and create another rotation that moves fromt he urrent rotation to the target rotation
            Quaternion newRotation = Quaternion.Lerp (playerRigidbody.rotation, targetRotation, turningSpeed * Time.deltaTime);
            // and change the player"s rotation to the new incremental rotation
            playerRigidbody.MoveRotation (newRotation);
            // then play the jump animation
            playerAnimator.SetFloat ("Speed", 3f);
        } else {
            //otherwise don't play the jump animation
            playerAnimator.SetFloat ("Speed", 0f);
        }
    }

    playerRigidbody = this.GetComponent<Rigidbody> ();

private Animator playerAnimator; //private means info stored in var are available only for playermovement class. 
private float moveHorizontal;
private float moveVertical;
private Vector3 movement; // Vector3 type variable is used for storing the movement vector in 3d, the direction the player is moving.

// Use this for initialization
void Start () {
    //Gather animator component from game object
    playerAnimator = GetComponent<Animator> (); //we are assigning the animation to the animator component

}

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

    movement = new Vector3(moveHorizontal, 0.0f, moveVertical); //0.0f says that the frog must stay on xy plane and not flying away
}

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