Al completar la clase me sale una ventana con este error “Can`t add script component ´playerController´ because the script class cannot b...

Al completar la clase me sale una ventana con este error “Can`t add script component ´playerController´ because the script class cannot be found. Make sure that there are no compile errors and that the file name and class name match.” y no me deja realizar la animación del personaje, ¿alguien puede ayudarme o decirme como solucionarlo?

Este es mi codigo

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerController : MonoBehaviour
{

    //Variables del movimiento del personaje
    public float jumpForce = 6f;
    public float runningSpeed = 2f;

    Rigidbody2D rigidBody;
    Animator animator;

    const string STATE_ALIVE = "isAlive";
    const string STATE_ON_THE_GROUND = "isOnTheGround";

    public LayerMask groundMask;

    void Awake()
    {
        rigidBody = GetComponent<Rigidbody2D>();
        animator = GetComponent<Animator>();
    }

    // Use this for initialization
    void Start()
    {
        animator.SetBool(STATE_ALIVE, true);
        animator.SetBool(STATE_ON_THE_GROUND, true);
    }

    // Update is called once per frame
    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Space) || Input.GetMouseButtonDown(0))
        {
            Jump();
        }

        animator.SetBool(STATE_ON_THE_GROUND, IsTouchingTheGround());

        Debug.DrawRay(this.transform.position, Vector2.down * 1.5f, Color.red);
    }

    void FixedUpdate()
    {
        if (rigidBody.velocity.x < runningSpeed)
        {
            rigidBody.velocity = new Vector2(runningSpeed, //x
                                             rigidBody.velocity.y //y
                                            );
        }
    }

    void Jump()
    {
        if (IsTouchingTheGround())
        {
            rigidBody.AddForce(Vector2.up * jumpForce, ForceMode2D.Impulse);
        }
    }

    //Nos indica si el personaje está o no tocando el suelo
    bool IsTouchingTheGround()
    {
        if (Physics2D.Raycast(this.transform.position,
                             Vector2.down,
                             1.5f,
                             groundMask))
        {
            //TODO: programar lógica de contacto con el suelo
            return true;
        }
        else
        {
            //TODO: programar lógica de no contacto
            return false;
        }
    }

}