Object reference not set to an instance of an object

Questions & Answers
1

using UnityEngine;
using System.Collections;

public class enemySpawner : MonoBehaviour {
	
	private int c;
	private Vector3[] spawnPoints;

	void Awake() {
		BoxCollider b = gameObject.collider as BoxCollider;
		
		for (int x = 0; x <= b.size.x; x++) {
			for (int z = 0; z <= b.size.z; z++) {
				spawnPoints

 = new Vector3(x, 0, z);   //this is where I get the error
    				c++;
    			}
    		}
    		print(spawnPoints);
    	}
    }

And the full error:

    NullReferenceException: Object reference not set to an instance of an object
    enemySpawner.Awake () (at Assets/Scripts/enemySpawner.cs:14)

What am I missing? As far as I can tell, the code is correct. I guess C# is just extremely picky. I'm sure this is a very easy fix, thanks in advance.
2

You’ve declared a spawnPoints array, but you haven’t allocated memory for it.

Inside your Awake function, you need to allocate the array…

spawnPoints = new Vector3[x];

Where x is the number of elements you want to allocate.