每波增加敌人的生命值

Question

As the title says, I want to increase my enemy hp after every wave, however after wave 1 i get "IndexOutOfRangeException: Index was outside the bounds of the array." error

note: i'm still a beginner and this is the first project i'm working on, i followed a tutorial for this script (i wrote some stuff myself too)

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

public class WaveSpawner : MonoBehaviour
{
    public enum SpawnState { SPAWNING, WAITING, COUNTING };
    public int waveNumber = 0;
    [SerializeField] public TMP_Text waveNumberTextValue;
    public bool waveEnded = false;

    [System.Serializable]
    public class Wave
    {
        public string name;
        public Transform enemy;
        public int count;
        public float rate;
    }

    public Wave[] waves;
    private int nextWave = 0;

    public Transform[] spawnPoints;

    public float timeBetweenWaves = 5f;
    private float waveCountdown;

    private float searchCountdown = 1f;

    private SpawnState state = SpawnState.COUNTING;


    void Start()
    {

        waveNumber = 1;
        waveCountdown = timeBetweenWaves;
    }
    
    public void EnemyHpIncrease()
    {
        if (waveEnded == true)
        {
            if(waveNumber <= 10)
            {
                FindObjectsOfType<EnemyHealth>()[0].enemyHealth += 100f;
            }
            else
            {
                FindObjectsOfType<EnemyHealth>()[0].enemyHealth *= 1.1f;
            }
        }
    }

    void Update()
    {
        waveNumberTextValue.text = "Wave " + waveNumber.ToString("0");
        if(state == SpawnState.WAITING)
        {
            if(!EnemyIsAlive())
            {
                WaveCompleted();
                Debug.Log("hp increased by 100hp");
                waveEnded = true;
                waveNumber++; 
                
                
            }
            else
            {
                return;
            }
        }

        if(waveCountdown <= 0)
        {
            if(state != SpawnState.SPAWNING)
            {
                StartCoroutine(SpawnWave(waves[nextWave]));
            }
        }
        else
        {
            waveCountdown -= Time.deltaTime;
        }
    }

    public void WaveCompleted()
    {
        waveEnded = true;
        EnemyHpIncrease();
        state = SpawnState.COUNTING;
        waveCountdown = timeBetweenWaves;

        if(nextWave + 1 > waves.Length - 1)
        {
            nextWave = 0;
            Debug.Log("ALL WAVES COMPLETED!");
        }
            else
        {
            nextWave++;
        }
    }

    bool EnemyIsAlive()
    {
        searchCountdown -= Time.deltaTime;
        if(searchCountdown <= 0f)
        {
            searchCountdown = 1f;
            if(GameObject.FindGameObjectWithTag("Enemy") == null)
            {
                
                return false;
            }
        }
        return true;
    }

    IEnumerator SpawnWave (Wave _wave)
    {
        Debug.Log("Spawning Wave" + _wave.name);
        state = SpawnState.SPAWNING;
        waveEnded = false;

        for (int i = 0; i < _wave.count; i++)
        {
            SpawnEnemy(_wave.enemy);
            yield return new WaitForSeconds( 1f/_wave.rate );
        }

        state = SpawnState.WAITING;
        yield break;
    }

    void SpawnEnemy(Transform _enemy)
    {
        Debug.Log("Spawning Enemy" + _enemy.name);
        Transform _sp = spawnPoints[Random.Range(0, spawnPoints.Length)];
        Instantiate (_enemy, _sp.position, _sp.rotation);
    }
}

i tried putting debug.log everywhere and it doesnt show anymore after WaveCompleted(); in

                WaveCompleted();
                Debug.Log("hp increased by 100hp");
                waveEnded = true;
                waveNumber++; 
         

errors:

IndexOutOfRangeException: Index was outside the bounds of the array.
WaveSpawner.EnemyHpIncrease () (at Assets/scripts/WaveSpawner.cs:48)
WaveSpawner.WaveCompleted () (at Assets/scripts/WaveSpawner.cs:93)
WaveSpawner.Update () (at Assets/scripts/WaveSpawner.cs:65)

Answer 1

The IndexOutOfRangeException is on line 48:

IndexOutOfRangeException: Index was outside the bounds of the array.
WaveSpawner.EnemyHpIncrease () (at Assets/scripts/WaveSpawner.cs:48) <-- line number here

Copying your code into Notepad++, line 48 appears to be the following:

FindObjectsOfType<EnemyHealth>()[0].enemyHealth += 100f;

The code is assuming that the result of the FindObjectsOfType<> method is returning an array with at least one element. I assume that the result in this case is an empty array, so there is no element at position 0.