How can i load resources with a path?? c#

So im trying to load resources with a certain path.

I'm currently doing this: using UnityEngine; using System.Collections;

 public abstract class SpellDataBase  {
 
     private string TexturePath = "GameArt/SpellIcons/";
     public Texture2D icon;
     private PlayerHUD owner;
 
     public abstract void Cast();
 
     public class FireBall : SpellDataBase
     {
         public FireBall(PlayerHUD owner)
         {
             this.owner = owner;
             this.icon = Resources.Load(TexturePath + "FireBall") as Texture2D;
         }
 
         public override void Cast()
         {
             Debug.Log("FireBall casted...");
         }
     }
 }

But I get no luck, can someone please assist me. I tried looking on the forums, but the fixes don't work.