Object reference not set to an instance of an object TowerController

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

public class EnemyController1: MonoBehaviour
{
    // 判断塔目标是否存在，判断两者距离，如果距离在范围内，切换到走路状态，走向塔；当距离在可攻击范围内，停止走路，开始攻击
    float walkdistance = 4.2f;
    float attackdistance = 0.8f;
    float speed = 0.005f;

    public Slider enemySlider;
    public float enemyLife = 100;
    private Animator animator;
    private AudioSource enemyvoice;


    void Start()
    {
        animator = GetComponent<Animator>();
        enemyvoice = GetComponent<AudioSource>();
    }

    void Update()
    {
        GameObject tower = GameObject.Find("Tower");
        if (tower != null)
        {
            float distance = Vector3.Distance(tower.transform.position, transform.position);
            Debug.Log(distance);
            if (distance < walkdistance)
            {
                animator.SetBool("walk", true);
                transform.position = Vector3.MoveTowards(transform.position, tower.transform.position, speed);
                if (distance <= attackdistance)
                {
                    speed = 0;
                    animator.SetBool("walk", false);
                    animator.SetBool("attack", true);
                }
            }
            //人物停止攻击回到待机状态
            if (tower.GetComponent<TowerController>().towerLife <= 0)//判断塔的血量是否小于0
            {
                animator.SetBool("attack", false);
                animator.SetBool("walk", false);
                animator.SetBool("idle", true);
            }
        }
    }
    private void OnCollisionEnter(Collision collision)
    {
        if (collision.gameObject.name == "Ball(Clone)")
        {
            animator.SetTrigger("hit");
            enemyvoice.Play();
            enemyLife -= 5f;
            enemySlider.value = enemyLife;
            if (enemyLife <= 0)
            {
                animator.SetBool("die", true);
            }
        }
    }
}

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

public class TowerController : MonoBehaviour
{
// 1.当被攻击的时候，掉血2.发出警报的声音3.可以从炮口发出子弹还击，4.塔的血量到零，塔身变暗，敌人停止攻击
public float towerLife = 100f;
public Slider towerSlider;
private AudioSource towervoice;

float shotDistance = 2.2f;

public GameObject bullet;
public Transform shotPosition;
public float speed = 4;

float timego = 1;
void Start()
{
    towervoice = GetComponent<AudioSource>();
}

// Update is called once per frame
void Update()
{
    //当敌人走到一定距离的时候，开始发射炮弹
    GameObject enemy = GameObject.Find("Enemy");
    if (enemy != null) 
    {
        float distance = Vector3.Distance(enemy.transform.position, transform.position);
        if (distance <= shotDistance)
        {
            //发射
            if (towerLife > 0 && enemy.GetComponent<EnemyController1>().enemyLife > 0)
           {
              timego += Time.deltaTime;
              if (timego >= 1)
             {
               GameObject shot = Instantiate(bullet, shotPosition.position, shotPosition.rotation);
               Rigidbody rb = shot.GetComponent<Rigidbody>();
               rb.velocity = shotPosition.forward * speed;
               timego = 0;
              }
           }
        }
    }
}

private void OnTriggerEnter(Collider other)//当碰撞体被碰到，并且是斧头的时候，表示攻击，掉血

{
if (other.gameObject.name == "Sword")
{
if (!towervoice.isPlaying)
{
towervoice.Play();
}
towerLife -= 5f;
towerSlider.value = towerLife;

    if (towerLife <= 0)
    {
        towervoice.Stop();
        Renderer[] renderers = GetComponentsInChildren<Renderer>();
        foreach (Renderer ren in renderers)
        {
            ren.material.color = Color.black;
        }
        //攻击停止
    }
}

}

这个一连摄像头就报这个错误，但是不连接摄像头处理就可以正常运行。

换一个摄像头，或者换一个软件虚拟摄像头呢？

检查一下那个Enemy对象上有没有挂载脚本EnemyController,没有就会报这个错。

gameobject.find和getcompoenet这种操作不要放在update里，很耗费性能，我建议你先把update里的这些逻辑摘出来，然后再看一下，因为根据你的描述来看并不像你的代码逻辑的问题