提示Object reference not set to an instance of an object。未将对象引用设置到对象的实例 怎么搞啊

using UnityEngine;

using System.Collections;

public class Player : MonoBehaviour

{

public  GameObject   mClickEffectPrefab;

public  GameObject   mClickEffect;

public float walkSpeed = 2f;

public Light light;

public MovementMotor movement;

private Vector3[] mPath;

private bool bWalking = false;

private int mPathIndex = 0;

// Use this for initialization

void Start ()

{

GameObject.Find ("Main Camera").GetComponent<SceneCamera> ().player = this.gameObject;

}

// Update is called once per frame

void Update ()

{

// Debug.Log ("Horizontal value: " + Input.GetAxis ("Horizontal"));

Vector3 direction = Input.GetAxis ("Horizontal") * transform.right + 

Input.GetAxis ("Vertical") * transform.forward;

//movement.movementDirection = direction.normalized;

// GetComponent<Rigidbody> ().AddForce (direction.normalized * walkSpeed, ForceMode.Acceleration);

transform.position = transform.position + 

walkSpeed * direction * Time.deltaTime ;

WalkForward ();

return;

if (bWalking) {

bWalking = Walking ();

} else {

}

}

public void WalkTo (Vector3 pos, bool withClickEffect = true)

{

if ((this.transform.position - pos).magnitude < 0.001f) {

return;

}

Vector3[] corners = CalcPathCorners (this.transform.position, pos);

if (corners.Length >= 2) {

bWalking = true;

mPath = corners;

bWalking = true;

// Animation anim = GetComponent<Animation> ();

// anim.CrossFade ("run_forward", 0.3f);

mPathIndex = 0;

transform.position = mPath [0];

if (mClickEffect != null && withClickEffect) {

mClickEffect.SetActive (true);

pos.y += 0.5f;

mClickEffect.transform.position = pos;

Invoke ("HideClickEffect", 1.5f);

}

}

}

private void HideClickEffect ()

{

if (mClickEffect != null) {

mClickEffect.SetActive (false);

}

}

private bool Walking ()

{

bool re = true;

Vector3 curSegSrc = mPath [mPathIndex];

Vector3 curSegDst = mPath [mPathIndex + 1];

Vector3 curPos = transform.position;

Vector3 normalDir = (curSegDst - curSegSrc);

normalDir.Normalize ();

curPos += (normalDir * walkSpeed * Time.deltaTime);

float over = (curPos - curSegSrc).magnitude - (curSegDst - curSegSrc).magnitude;

if (over > 0) {

mPathIndex ++;

if (mPathIndex > mPath.Length - 2) {

curPos = mPath [mPath.Length - 1];

transform.position = curPos;

re = false;

Animation anim = GetComponent<Animation> ();

// anim.CrossFade ("idle", 0.3f);

} else {

curSegSrc = mPath [mPathIndex];

curSegDst = mPath [mPathIndex + 1];

normalDir = (curSegDst - curSegSrc);

normalDir.Normalize ();

curPos = curSegSrc + normalDir * over;

transform.position = curPos;

}

} else {

transform.position = curPos;

}

return re;

}

Vector3[] CalcPathCorners (Vector3 src, Vector3 dst)

{

Vector3[] corners = null;

NavMeshPath path = new NavMeshPath ();

//if (NavMesh.CalculatePath(src, dst, -1, path)){

if (false) {

corners = path.corners;

} else {

corners = new Vector3[2]{src, dst};

}

return corners;

}

void WalkForward()

{

transform.position = transform.position + walkSpeed * transform.forward * Time.deltaTime ;

}

}