Error CS0103: The name " " does not in exist in the current context. This happens in several places.

using UnityEngine;
using System.Collections;

public class PlayerMovement : MonoBehaviour {

    private Animator playerAnimator;
    private float moveHorizontal;
    private float moveVertical;
    private Vector3 movement;
    private float turningSpeed = 20f;
    private Rigidbody playerRigidbody;

    // Use this for initialization
    void Start () {

        // Gather components from the play GameObject
        playerAnimator = GetComponent<Animator> ();
        playerRigidbody = GetComponent<Rigidbody> ();

    }

    // Update is called once per frame
    void Update () {

        // Gather input from the keyboard
        moveHorizontal = Input.GetAxisRaw ("Horizontal");
        moveVertical = Input.GetAxisRaw ("Vertical");

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

    }

    void FixedUpdate () {

        // If the player's movement vector does not equal zero...
        if (movement != Vector3.zero) {

            // ...then create a target rotation based on the movement vecor...
            Quaternion targetRotation = Quaternion.LookRotation(movement, Vector3.up);

            // ...and create another rotation that moves from the current roatation to the target rotation...
            Quaternion newRotation = Qauternion.Lerp (playerRigidbody.rotation, targetRotation, turningSpeed * Time.deltaTime);

            // ...and change the player's rotation to thenew incremental rotation...
            playRotation.MoveRotation(newRotation);

            // ...then play the animation.
            playerAnimator.SetFloat ("Speed", 3f);
        } else {
            //Otherwise don't play the animation
            playerAnimator.SetFloat ("Speed", 0f);
        }

    }

}