유니티(SwipeCar)- 실행이 안됨-"해결"

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

public class CarController : MonoBehaviour
{
    private float speed = 0;
    // Start is called before the first frame update
    void Start()
    {

    }

    // Update is called once per frame
    void Update()
    {
        //왼쪽 버튼을 눌렀다면 
        if (Input.GetMouseButtonDown(0))
        {
            this.speed = 0.2f;  //스피드를 초기화 
        }

        this.transform.Translate(this.speed, 0, 0); //이동 
        this.speed *= 0.98f;    //감속 
    }
}