Unexpected symbol `void' in class, struct, or interface member declaration?

using UnityEngine; using System.Collections;

public class Parallaxing : MonoBehaviour { public Transform [] backgrounds; //Array(Una lista) de todos los fondos y pisos que se les aplique parallaxing private float [] parallaxScales; // public float smoothing = 1f; // How smooth the parallax is going to be. Make sure to make this above 0

 private Transform cam;                    //Reference to the main camera transform
 private Vector3 previousCamPos                //Position of the camera in the previous frame

 void Awake ()        // great for references
 {           //set up the camera reference
     cam = Camera.main.transform;

 
 }




 void Start () 
 {

     previousCamPos = cam.position;

     //asigning parallaxScales
     parallaxScales = new float[backgrounds.Length];

     for (int i = 0; i < backgrounds.Length; i++)
     {
         parallaxScales [i] = backgrounds [i].position.z*-1;

     }

 }
 

 void Update () 
 {
 //for each backgroun
     for (int i = 0; i < backgrounds.Lenght; i++);
     //the parallax is the opposite of the camera movement because the previous frame multiplied by the scale
     {
         float parallax = (previousCamPos.x = CamPosition.x = cam.position.x) * parallaxScales [i];    
         //set a target x position which is the current position plus the parallax
         float backgroundTargetPosX = backgrounds[i].position.x + parallax;
         //create a target position which is the background s current position with its target position
         Vector3 backgroundTargetPos = new Vector3 (backgroundTargetPosX, backgrounds[i].position.y, backgrounds [i].position.z);
         //fade between current position  and the target position using lerp
         backgrounds[i].position = Vector3.Lerp ( backgrounds[i].position, backgroundTargetPos, smoothing * Time.deltaTime);
     }
     //set the PreviuosCamPos to the camera s position at the end of the frame
     previousCamPos = cam.position;

 }

}

I have a public Transform [] backgrounds; in the first line