Ошибка при запуске скрипта

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class RayShooter : MonoBehaviour
{
    private Camera _camera;
    // Start is called before the first frame update
    void Start() {
        [B]_camera = GetComponent();[/B]
 
        Cursor.lockState = CursorLockMode.Locked;
        Cursor.visible = false;
    }
 
    private void OnGUI()
    {
        int size = 12;
        float posX = _camera.pixelWidth / 2 - size / 4;
        float posY = _camera.pixelHeight / 2 - size / 2;
        GUI.Label(new Rect(posX, posY, size, size), "*");
    }
 
    // Update is called once per frame
    void Update()
    {
        if (Input.GetMouseButtonDown(0)) {
            Vector3 point = new Vector3(
                _camera.pixelWidth / 2, _camera.pixelHeight / 2, 0);
            Ray ray = _camera.ScreenPointToRay(point);
            RaycastHit hit;
            if (Physics.Raycast(ray, out hit))
            {
                StartCoroutine(SphereIndicator(hit.point));   
            }
        }
    }
 
    private IEnumerator SphereIndicator(Vector3 pos)
    {
        GameObject sphere = GameObject.CreatePrimitive(PrimitiveType.Sphere);
        sphere.transform.position = pos;
 
        yield return new WaitForSeconds(1);
 
        Destroy(sphere);
    }
}

_camera = GetComponent<Camera>();