I am creating a simple program in Unity C# that will generate a 2d grid using a 2d sprite prefab. I am stuck here, I don't know what to do. When ran, I receive an error.

Assets/Generator.cs(22,75): error CS0165: Use of unassigned local variable `grid_object'

I am a beginner, so I'm not sure what to do. This is most likely a rookie mistake, so thanks in advance.

using UnityEngine;
using System.Collections;
public class Generator : MonoBehaviour {

public float Width = 20;
public float Height = 20;
public Transform grid_object;
private GameObject [,] grid = new GameObject[20,20];

void Start () {

private void CreateGrid() {

    for (int x = 0; x < Width; x++) {
        for (int y = 0; y < Height; y++) {
            GameObject grid_object = (GameObject)Instantiate(grid_object);
            grid_object.transform.position = new Vector2(
            grid[x,y] = grid_object;
  • 1
    \$\begingroup\$ A core requirement, in programming, is that you give variables unique names. Your issue comes from having two variables labelled "grid_object". Hopefully, this answers your question; this is ultimately a generic programming question, as this is something that is not specific to game development. We don't consider these sort of questions on topic for GameDevSE, but feel free to look for more information at StackOverflow. \$\endgroup\$
    – Gnemlock
    Commented Dec 22, 2016 at 5:37
  • \$\begingroup\$ This is example of 2d grid generation that will help you \$\endgroup\$ Commented Dec 22, 2016 at 6:07

1 Answer 1


Your Transform grid_object and your GameObject grid_object have the same name. Change one of them to something different and it should work.


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