Can't access another script, think it may be due to namespace/public class ?

I'm having trouble accessing another script in my project. This is the script I want to access -

 using System;
 using UnityEngine;
 
 namespace UnityStandardAssets.ImageEffects
 {
     [ExecuteInEditMode]
     [RequireComponent (typeof(Camera))]
     [AddComponentMenu ("Image Effects/Camera/Vignette and Chromatic Aberration")]
     public class VignetteAndChromaticAberration : PostEffectsBase
     {
         public enum AberrationMode
         {
             Simple = 0,
             Advanced = 1,
         }
 
 
         public AberrationMode mode = AberrationMode.Simple;
         public static float intensity = 0.0f; //I CHANGED THIS TO A STATIC VARIABLE !
 

and I'm using this script to access/change the other script -

 using UnityEngine;
 using System.Collections;
 
 public class FadeOut : MonoBehaviour
 {
 
     private bool levelCompleted = false;
     public float fadeAmount;
     
     void OnTriggerEnter(Collider collider)
     { 
         if(collider.gameObject.name == "Player")
         {
             levelCompleted = true;
         }
         
     }
     void Update()
     {
         if(levelCompleted = true)
         {
             VignetteAndChromaticAberration.intensity += fadeAmount;
         }
     }
 }
 

I'm getting this error -

Assets/Scripts/FadeOut.cs(22,25): error CS0103: The name `VignetteAndChromaticAberration' does not exist in the current context

I think (please correct me if I'm wrong) its something to do with namespace / public class. I've not come across a script yet that uses the namespace thing so that I tink is why I having issues with finding the 'other' script.

???