Creating a map with tiles of different shapes by reading an image

Update:

I managed to narrow down the problem to the 'resource.load' function. It appears the function cannot load the bitmap or cannot find it since its returning a null. The bitmap 'provinces.bmp' is found inside folder 'Map' which is found inside folder 'Resources'. The function resource.load has the string "Assets/Resources/Map/provinces.bmp" as variable in order to find the path. I tried removing the .bmp from the path, remove the folder Map and even remove 'Assets/Resources' from the path. None have worked. Does anyone know why this is happening?

Original:

Hi,

I am following this tutorial about Procedural Cave Generation and decided to try and create a script that uses an image instead of using procedural generation. The image consists of a map that is made up of tiles (similar to this). The tiles have different shapes and each tile uses a unique RGBA code. I created a new project with an empty object, created the folder 'Map' to store the image and stored the folder in another folder named 'Resources'. I also created a script named 'MeshGenerator' and attached it to the empty object. The following is the code inside the script.

 using UnityEngine;
 using System.Collections;
 
 public class MeshGenerator : MonoBehaviour
 {
     public Texture2D mapImage;
     public string mapImagePath = "Assets/Resources/Map/provinces.bmp";
     private Color[,] mapArray;
 
     void Start()
     {
         ImageToArray();
     }
 
     public void ImageToArray()
     {
         mapImage = (Texture2D)Resources.Load(mapImagePath, typeof (Texture2D));
         mapArray = new Color[mapImage.width, mapImage.height];
         for (int x = 0; x < mapArray.GetLength(0); x++)
         {
             for (int y = 0; y < mapArray.GetLength(1); y++)
             {
                 mapArray[x, y] = mapImage.GetPixel(x,y);
             }
         }
     }
 
     public void OnDrawGizmos()
     {
         if(mapArray != null)
         {
             for (int x = 0; x < mapArray.GetLength(0); x++)
             {
                 for (int y = 0; y < mapArray.GetLength(1); y++)
                 {
                     Gizmos.color = mapArray[x, y];
                     Vector3 position = new Vector3(-mapArray.GetLength(0) / 2 + x + .5f, 0, -mapArray.GetLength(1) / 2 + y + .5f);
                     Gizmos.DrawCube(position, Vector3.one);
                 }
             }
         }
     }
 }

Method ImageToArray loads the image and copies the RGBA of every pixel in an array. OnDrawGizmos uses the array to draw the map. When I try to run the game, I get the following errors:

• The referenced script on this Behaviour is missing!

• The referenced script on this Behaviour (Game Object 'Map Generator') is missing!

• NullReferenceException: Object reference not set to an instance of an object

• MeshGenerator.ImageToArray () (at Assets/Scripts/MeshGenerator.cs:18)

• MeshGenerator.Start () (at Assets/Scripts/MeshGenerator.cs:12)

What am I doing wrong exactly?