Why does my Point light turn off if Player walks in any direction in Unity 2D?

Question

My 2D Sprite has a material, Sprite diffuse attached to it.

Now when I set up a light, it works but if I play the Game and walk, the light turns off immediately and the Player turns black.

The light is set up, Type as Point and Baking as Realtime, Distance at Z-axis is -25.

The Camera distance is at -30 on the Z-axis.

The Player is at 0 on the Z-axis.

I set the light between Camera and Player, but I also have a Camera Follows Player script, maybe it causes the problem, but I watched the Z-axis while playing and it doesn't move on the Z-axis.

I will also post Camera Script if someone can detect any problem.

---

{
    private Vector2 velocity;

  public float smoothTimeY;
  public float smoothTimeX;

  public GameObject player;

  // Use this for initialization
  void Start () 
  {
    player = GameObject.FindGameObjectWithTag("Player");
  }

  // Update is called once per frame
  void FixedUpdate () 
  {
    float posX = Mathf.SmoothDamp (transform.position.x, player.transform.position.x, ref velocity.x, smoothTimeX);
    float posY = Mathf.SmoothDamp (transform.position.y, player.transform.position.y, ref velocity.y, smoothTimeX);

    transform.position = new Vector3 (posX, posY + 29, transform.position.z);
  }
}