IndexOutOfRangeException

Unity Engine
1

Hello,
i am working on Tower Defense game. I am getting this error since yesterday and i am still don’t know how to solve this.
Error:

IndexOutOfRangeException: Index was outside the bounds of the array.
WaveSpawner+<SpawnWave>d__11.MoveNext () (at Assets/Scripts/WaveSpawner.cs:56)
UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) (at <c6b52566f59b49fc861a7812a1ea2f6b>:0)
UnityEngine.MonoBehaviour:StartCoroutine(IEnumerator)
WaveSpawner:Update() (at Assets/Scripts/WaveSpawner.cs:41)

Wave Spawner Script:

using System;
using System.Collections;
using System.Collections.Generic;
using System.Security.Cryptography;
using UnityEngine;
using UnityEngine.UI;

public class WaveSpawner : MonoBehaviour
{
    public static int enemiesAlive = 0;
    public Wave[] waves;
    public float timeBetweenWaves;
    public Transform spawnpoint;
  
    public Text countdownText;
    public GameObject countdownPanel;
    public GameManager gameManager;

    private float countdown = 3.5f;
    private int waveIndex = 0;

    private void Start()
    {
        countdownPanel.SetActive(true);
        enemiesAlive = 0;
    }
    // Update is called once per frame
    void Update()
    {
        if (enemiesAlive > 0)
        {
            return;
        }
        if (waveIndex == waves.Length)
        {
            gameManager.WinLevel();
        }
        if (countdown <= 0f)
        {
            countdownPanel.SetActive(false);
            StartCoroutine(SpawnWave());
            countdown = timeBetweenWaves;
            return;
        }
        countdown -= Time.deltaTime;
        countdown = Mathf.Clamp(countdown, 0f, Mathf.Infinity);
        countdownText.text = countdown.ToString("0");
        //Mathf.Round(PlayerStats.waves).ToString("00")
    }


    IEnumerator SpawnWave()
    {
        PlayerStats.waves++;

        Wave wave = waves[waveIndex]; //IndexOutOfRangeException


        //enemiesAlive = wave.enemyCount;
        for (int i = 0; i < wave.enemy1Count; i++)
        {
            SpawnEnemy1(wave.enemy1);
            yield return new WaitForSeconds(1f / wave.enemy1SpawnTime);
        }
        for (int i = 0; i < wave.enemy2Count; i++)
        {
            SpawnEnemy2(wave.enemy2);
            yield return new WaitForSeconds(1f / wave.enemy2SpawnTime);
        }
        waveIndex++;
    }
    void SpawnEnemy1(GameObject enemy1)
    {
        Instantiate(enemy1, spawnpoint.position, spawnpoint.rotation);
        enemiesAlive++;
    }
    void SpawnEnemy2(GameObject enemy2)
    {
        Instantiate(enemy2, spawnpoint.position, spawnpoint.rotation);
        enemiesAlive++;
    }
}
2

Simple, don’t go out of range of your collection. Chances are you’re calling SpawnWave when you shouldn’t, since you’re calling it from Update, you need to stop it from calling that coroutine once you win.

1 Like
3

There is nothing mysterious here at all.

Here are some notes on IndexOutOfRangeException and ArgumentOutOfRangeException:

http://plbm.com/?p=236

Steps to success:

  • find which collection it is (critical first step!)
  • find out why it has fewer items than you expect
  • fix whatever logic is making the indexing value exceed the collection
  • remember you might have more than one instance of this script in your scene/prefab