Unity3d scripting error c# IndexOutOfRangeException: Array index is out of range

Question

This is my spawning script belowwritten in c# The script should create objects randomly in the scene.

The issue is that I'm getting this error at runtime.

IndexOutOfRangeException: Array index is out of range.
CreateEasterEggs.MakeThingToSpawn () (at Assets/CreateEasterEggs.cs:52)
CreateEasterEggs.Update () (at Assets/CreateEasterEggs.cs:28)

Not sure what I have done wrong, thinking its something to do with the game object?

Thank you.

---

using UnityEngine;
 using System.Collections;

 public class CreateEasterEggs : MonoBehaviour
 {
     public float secondsBetweenSpawning = 0.1f;
     public float xMinRange = -25.0f;
     public float xMaxRange = 25.0f;
     public float yMinRange = -5.0f;
     public float yMaxRange = 0.0f;
     public float zMinRange = -25.0f;
     public float zMaxRange = 25.0f;
     public GameObject[] spawnObjects; // what prefabs to spawn

     private float nextSpawnTime;

     void Start ()
     {
         // determine when to spawn the next object
         nextSpawnTime = Time.time+secondsBetweenSpawning;
     }

     void Update ()
     {
         // if time to spawn a new game object
         if (Time.time  >= nextSpawnTime) {
             // Spawn the game object through function below
             MakeThingToSpawn ();

             // determine the next time to spawn the object
             nextSpawnTime = Time.time+secondsBetweenSpawning;
         }   
     }

    void MakeThingToSpawn ()
      {
          //Start the vector at an invalid position
          Vector3 spawnPosition = new Vector3(0, 0, 0);

          //while we are not in the right range, continually regenerate the position
          while ((spawnPosition.z < 4 && spawnPosition.z > -4) || (spawnPosition.x < 4 && spawnPosition.x > -4)) 
          {
              spawnPosition.x = Random.Range (xMinRange, xMaxRange);
              spawnPosition.y = Random.Range (yMinRange, yMaxRange);
              spawnPosition.z = Random.Range (zMinRange, zMaxRange);
          }

          // determine which object to spawn
          int objectToSpawn = Random.Range (0, spawnObjects.Length);

          // actually spawn the game object
              GameObject spawnedObject = Instantiate (spawnObjects [objectToSpawn], spawnPosition, transform.rotation) as GameObject;

          // make the parent the spawner so hierarchy doesn't get super messy
          spawnedObject.transform.parent = gameObject.transform;
      }
 }

Answer 1

IndexOutOfRange means that you tried to access to an element of an array that doesn't exist.

In your case as you are doing it with Random.Range (0, spawnObjects.Length); Then the only possible case is that your array is empty.

Try to Debug.Log(spawnObjects.Length): before the Instantiate and you will see that in fact your array of gameobjects is empty as It will return 0.