Script Error Coroutine

[Manou_Chou]

I am getting this error. I am completely lost at the moment and can’t get further. I took your code from GITHUB and same issue.

My error Message:
ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
System.ThrowHelper.ThrowArgumentOutOfRangeException (System.ExceptionArgument argument, System.ExceptionResource resource) (at :0)
System.ThrowHelper.ThrowArgumentOutOfRangeException () (at :0)
System.Collections.Generic.List`1[T].get_Item (System.Int32 index) (at :0)
EnemiesSpawner+d__3.MoveNext () (at Assets/Script/EnemiesSpawner.cs:22)
UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) (at C:/buildslave/unity/build/Runtime/Export/Coroutines.cs:17)
UnityEngine.MonoBehaviour:StartCoroutine(IEnumerator)
EnemiesSpawner:Start() (at Assets/Script/EnemiesSpawner.cs:15)

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class EnemiesSpawner : MonoBehaviour
{

    [SerializeField] List<WavesConfig> waveConfigs;
    int startingWave = 0;

    // Use this for initialization
    void Start()
    {
        var currentWave = waveConfigs[startingWave];
        StartCoroutine(SpawnAllEnemiesInWave(currentWave));
    }

    private IEnumerator SpawnAllEnemiesInWave(WavesConfig waveConfig)
    {
        for (int enemyCount = 0; enemyCount < waveConfig.GetNumberOfEnemies(); enemyCount++)
        {
            Instantiate(
                waveConfig.GetEnemyPrefab(),
                waveConfig.GetWaypoints()[0].transform.position,
                Quaternion.identity);
            yield return new WaitForSeconds(waveConfig.GetTimeBetweenSpawns());
        }
    }

}

WavesConfig.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

[CreateAssetMenu(menuName = "Enemy Wave Config")]
public class WavesConfig : ScriptableObject
{
    [SerializeField] GameObject enemyPrefab;
    [SerializeField] GameObject pathPrefab;
    [SerializeField] float timeBetweekSpawns = 0.5f;
    [SerializeField] float spawnRandomFactor = 0.3f;
    [SerializeField] int numberOfEnemies = 5;
    [SerializeField] float moveSpeed = 2f;

    public GameObject GetEnemyPrefab(){ return enemyPrefab;}

    public List<Transform> GetWaypoints()
    {
        var waveWaypoints = new List<Transform>();
        foreach(Transform child in pathPrefab.transform)
        {
            waveWaypoints.Add(child);
        }
        return waveWaypoints;
    }

    public float GetTimeBetweenSpawns() { return timeBetweekSpawns; }

    public float GetSpawnRandomFactor() { return spawnRandomFactor; }

    public int GetNumberOfEnemies() { return numberOfEnemies; }

    public float GetMoveSpeed() { return moveSpeed; }

}

[Rob]

Hi Manou,

From what I can tell, the error pointing to line 22 is your Instantiate statement in the SpawnAllEnemiesInWave method. The only place where there is an interaction with a List<T> (as per the error) is the GetWaypoints method call.

Perhaps you have passed in a WaveConfig who’s pathPrefab doesn’t contain any children, e.g. the waypoint transforms themselves?

[Manou_Chou]

Thank you very much!

I definitely forget to link the Path Prefab from my Wave 1 gameObject.

All Good

[Rob]

You’re very welcome