NullReferenceException：对象引用未设置为对象的实例PlayerMoveScript.OnTriggerEnter2D

Question

我在Unity3D工作，我收到错误

  

NullReferenceException：对象引用未设置为对象的实例PlayerMoveScript.OnTriggerEnter2D

你能帮帮我吗？谢谢:)）

PlayerMoveScript：

using UnityEngine;
using System.Collections;

public class PlayerMoveScript : MonoBehaviour {

public float speed;

BarrMoveScript barrMoveScript;


// Use this for initialization
void Start () {
    barrMoveScript = GetComponent<BarrMoveScript>();
}

// Update is called once per frame
void Update () {

    Vector3 pos = transform.position;

    if(Input.GetKeyDown(KeyCode.LeftArrow))
    {
        pos.x -= speed;
    }

    if (Input.GetKeyDown(KeyCode.RightArrow))
    {
        pos.x += speed;
    }

    if (Input.GetKeyDown(KeyCode.UpArrow))
    {
        pos.y += speed;
    }

    if (Input.GetKeyDown(KeyCode.DownArrow))
    {
        pos.y -= speed;
    }


    transform.position = pos;

}


void OnTriggerEnter2D(Collider2D col)
{
    if (col.CompareTag("con_col"))
    {
        print("con col");
        return;
    }

    else if(col.CompareTag("barr1"))
    {
        print("hi, i collide");
        barrMoveScript.IsInside(true);

    }

}


}

BarrMoveScript：

using UnityEngine;
using System.Collections;

public class BarrMoveScript : MonoBehaviour {

    public GameObject player;
    bool inside = false;

    // Use this for initialization
    void Start () {

    }

    public bool IsInside(bool insi)
    {
        if (insi)
            inside = true;
        return inside;
    }

    // Update is called once per frame
    void Update () {
        Vector3 pos = transform.position;

        if (Input.GetKeyDown(KeyCode.LeftArrow))
            inside = false;


        if (inside)
        {
            pos.x = player.transform.position.x;
            pos.y = player.transform.position.y;

            transform.position = pos;


        }


    }

}