Can´t access sprite from another script [C#]

Hey! Im following a tutorial about an easy inventory system.

My problem: I try to access a sprite decleration in inventory.cs from slot.cs.

Heres the Inventory.cs Script (i comment the line where the issue appears:

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine.UI;
 
 public class SlotNew : MonoBehaviour {
 
     private Stack<Item> items; 
     public Text stackText; 
 
     public Sprite slotEmpty;
     public Sprite slotHighlight;
 
 
     // Use this for initialization
     void Start () {
         items = new Stack<Item> ();
         RectTransform slotRect = GetComponent<RectTransform> ();
         RectTransform txtRect = GetComponent<RectTransform> ();
 
         int txtScaleFactor = (int)(slotRect.sizeDelta.x * 0.60);
         stackText.resizeTextMaxSize = txtScaleFactor;
         stackText.resizeTextMinSize = txtScaleFactor; 
 
         txtRect.SetSizeWithCurrentAnchors (RectTransform.Axis.Vertical, slotRect.sizeDelta.y);
         txtRect.SetSizeWithCurrentAnchors (RectTransform.Axis.Horizontal, slotRect.sizeDelta.x);
 
 
     }
     
     // Update is called once per frame
     void Update () {
     
     }
 
     public void AddItem(Item item)
 
     {
         items.Push (item);
 
         if (items.Count > 1) {
 
             stackText.text = items.Count.ToString ();
         }
 
         ChangeSprite (item.spriteNeutral , item.spriteHighlight);   **<-- spriteNeutral and spriteHighlight are RED.** 
     }
 
 
     private void ChangeSprite(Sprite neutral, Sprite highlight)
 
     {
         GetComponent<Image> ().sprite = neutral;
 
         SpriteState st = new SpriteState ();
 
         st.highlightedSprite = highlight;
         st.pressedSprite = neutral; 
 
         GetComponent<Button> ().spriteState = st; 
 
     }
 }

and here the slot.cs Script

 using UnityEngine;
 using System.Collections;
 
 public enum ItemType{MANA, HEALTH};
 
 public class ItemNew : MonoBehaviour {
 
     public ItemType type;
 
     public Sprite spriteNeutral;   **<-- i try to access this**
 
     public Sprite spriteHighlight; **<-- and this**
 
     public int maxSize;
 
 
     public void Use()
     {
         switch(type)
         {
         case ItemType.MANA:
             Debug.Log("I just used mana potion");
             break;
         case ItemType.HEALTH:
             Debug.Log("I just used health potion");
             break;
         
         }
     }
 
 
 
 }
 

i´ve tried almost everything possible and it seems no one else has the same problem i do in this tutorial. Link to the tutorial and the right part where he talks about this function: https://youtu.be/KLaGkc87dDQ?t=1h11m45s

Any ideas why i cant access it? Mono says: "Item" does not contain a definition for spriteNeutral.