Unity3d 如何解决这些错误

我正在开发关于Unity的二维游戏。但是我有一些错误。我不知道如何解决这些问题。我是一个新手，不喜欢某些链接。也许我正在创建检查点、繁殖点、死亡地带，这就是为什么会出现错误

PlayerRespawn.js-

var Player : GameObject;
var spawnPoint: Transform;

function OnTriggerEnter(other : Collider) {
Destroy(other.gameObject);
var P: GameObject = Instantiate(Player,spawnPoint.position,Quaternion.identity);
var sf=Camera.main.GetComponent(SmoothFollow);
sf.target=P.transform;
}

SmoothFollow.js-

var target : Transform;
// The distance in the x-z plane to the target
var distance = 10.0;
// the height we want the camera to be above the target
var height = 5.0;
// How much we 
var heightDamping = 2.0;
var rotationDamping = 3.0;

// Place the script in the Camera-Control group in the component menu
@script AddComponentMenu("Camera-Control/Smooth Follow")


function LateUpdate () {
    // Early out if we don't have a target
    if (!target)
        return;

    // Calculate the current rotation angles
    var wantedRotationAngle = target.eulerAngles.y;
    var wantedHeight = target.position.y + height;

    var currentRotationAngle = transform.eulerAngles.y;
    var currentHeight = transform.position.y;

    // Damp the rotation around the y-axis
    currentRotationAngle = Mathf.LerpAngle (currentRotationAngle, wantedRotationAngle, rotationDamping * Time.deltaTime);

    // Damp the height
    currentHeight = Mathf.Lerp (currentHeight, wantedHeight, heightDamping * Time.deltaTime);

    // Convert the angle into a rotation
    var currentRotation = Quaternion.Euler (0, currentRotationAngle, 0);

    // Set the position of the camera on the x-z plane to:
    // distance meters behind the target
    transform.position = target.position;
    transform.position -= currentRotation * Vector3.forward * distance;

    // Set the height of the camera
    transform.position.y = currentHeight;

    // Always look at the target
    transform.LookAt (target);
}

我得到的错误是-

NullReferenceException
PlayerRespawn.OnTriggerEnter (UnityEngine.Collider other) (at Assets/scripts/PlayerRespawn.js:8)

在这方面：

var sf=Camera.main.GetComponentSmoothFollow

---

检查是否已将SmoothFollow组件添加到主摄像头。可能问题是，在此语句之后，var sf为null。

可能缺少一些javascript文件，您应该将其添加到资产文件夹。如何知道缺少哪些javascript文件？当我运行项目时，根据PlayerRespawn脚本，我的播放机已死亡，然后创建新播放机，但播放机无法访问smoothfollow脚本。并且出现缺少引用异常我不理解您的评论。你能解释一下吗？实际上，我创建了繁殖点、检查点和死亡地带。当我运行我的项目时，我的角色正在运行并获得繁殖点和检查点。但当我的角色跳过死亡地带时，运行的项目将获得暂停，而角色不运行意味着保持不变。并在Assets/MyScripts/PlayerRespawn.js:8处出现以下错误，如NullReferenceException PlayerRespawn.OnTriggerEnter UnityEngine.Collider other，它有PlayerRespawn.js脚本和smoothfollow.js。