I'm following Brackeys' tutorial for perlin noise and i'm at the point where he's just done the offset thing but this whole time all that i'm seeing in my project is a plain gray square, no matter what settings i change. Here's my code:

using UnityEngine;

public class PerlinNoise : MonoBehaviour
{
    public int width = 256;
    public int height = 256;

    public float scale = 20f;

    public float offsetX = 100f;
    public float offsetY = 100f;

    void Update ()
    {
        Renderer renderer = GetComponent<Renderer>();
        renderer.material.mainTexture = GenerateTexture();
    }

    Texture2D GenerateTexture ()
    {
        Texture2D texture = new Texture2D(width, height);

        for (int x = 0; x < width; x++)
        {
            for (int y = 0; y < height; y++)
            {
                Color color = CalculateColor(x, y);
                texture.SetPixel(x, y, color);
            }
        }

        texture.Apply();
        return texture;
    }

    Color CalculateColor (int x, int y)
    {
        float xCoord = (float)x / width * scale + offsetX;
        float yCoord = (float)y / height * scale + offsetY;

        float sample = Mathf.PerlinNoise(x, y);
        return new Color(sample, sample, sample);
    }
}

Here's the result i get:

and here's the settings in the editor: