Elements of a 2D array are always null

I set up a tool a generate tiles for a level and store them in a 2D array. When I try to access them after I start the game, They always return null. Here is the code for the editor tool:

 using UnityEngine;
 using UnityEditor;
 using UnityEngine.UI;
 using System.Collections;
 
 public class TileGenerator : EditorWindow
 {
 
     static int y = 16;//size of the map
     static int x = 16;
 
     [MenuItem("Tile Board/Generate Tiles")]
     static void Begin()
     {
         TileGenerator selector = (TileGenerator)EditorWindow.GetWindow(typeof(TileGenerator));
         selector.Show();
     }
 
     void OnGUI()
     {
         y = EditorGUILayout.IntField("Height of map", y);
         x = EditorGUILayout.IntField("Width of map", x);
 
         if (GUILayout.Button("Generate Map"))
         {
             Create();
         }
     }
 
     static void Create()
     {
         Texture2D tilePNG = Resources.Load<Texture2D>("Sprites/Blank Tile");
         float Xdist = tilePNG.width/100.0f; //The x distance between collumns of tiles
         float Ydist = tilePNG.height/100.0f; //The y distance between rows of tiles
         Sprite tileImage = Sprite.Create(tilePNG, new Rect(0,0,tilePNG.width,tilePNG.height),new Vector2(.5f,.5f));//loads the default tile image so it does not need to be loaded everytime for each tile
 
         GameObject tileBlueprint = GameObject.Find("Tile Container");
         if (tileBlueprint != null)
         {
             GameObject.DestroyImmediate(tileBlueprint);
         }
         GameObject tileContainer = new GameObject("Tile Container");
         ZoneValues zoneInfo = tileContainer.AddComponent<ZoneValues>();
         zoneInfo.XSize = x;
         zoneInfo.YSize = y;
 
         for (int i = 0; i < x; i++)
         {
             for (int j = 0; j < y; j++)
             {
                 tileBlueprint = new GameObject("Tile (" + i + "," + j + ")");
                 tileBlueprint.transform.position = new Vector3(i * Xdist, j * Ydist, 1);//places the tile in position based on the coordinates
                 tileBlueprint.transform.tag = "Tile";
 
                 SpriteRenderer renderer = tileBlueprint.AddComponent<SpriteRenderer>();
                 renderer.sprite = tileImage;
                 tileBlueprint.transform.parent = tileContainer.transform;//puts Tile into easy to collapse container
                 renderer.sortingLayerName = "Tile";
 
                 TileValues thisTilesValues = tileBlueprint.AddComponent<TileValues>();
                 thisTilesValues.XPos = i;
                 thisTilesValues.YPos = j;
             }
         }
 
         //zoneInfo.StoreZone();
         zoneInfo.SetUpTiles();
         Debug.Log(zoneInfo.Tiles[0,0]);
     }
 }
 

This is the class where I store the array:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class ZoneValues : MonoBehaviour
 {
     public int xSize;
     public int ySize;
     private GameObject[,] tiles;
 
     public void SetUpTiles()
     {
         tiles = new GameObject[xSize, ySize];
         for (int i = 0; i < xSize; i++)
             for (int j = 0; j < ySize; j++)
                 tiles[i, j] = GameObject.Find("Tile (" + i + "," + j + ")");
     }
 
     public GameObject[,] Tiles
     {
         get { return tiles; }
     }
 
     public int XSize
     {
         get
         {
             return xSize;
         }
         set
         {
             xSize = value;
         }
     }
 
     public int YSize
     {
         get
         {
             return ySize;
         }
         set
         {
             ySize = value;
         }
     }
 
 }
 

And when I call it with this line during run time I get a null error:

             SetCurrentTile(zoneValues.Tiles[currentX,currentY]);

This system was working before I tried to store the tiles in a 2D array and I searched for them in the game hierarchy, but it would be much more efficient to directly access the tiles from a 2D array rather than doing a search every time I want the character to move.