Geting error: CS1525 Unexpected symbol `private' lines (34/15)

Hello guys, I started learning Unity today with help of the book: Unity in Action by Joshep Hocking.

The book concentrates on making an FPS game, so when I get to the part were I have to code the hit detection for the enemies, everytime that I type or copy/paste the example code to get a console log when the engine registers a hit on the enemies, I get the error in the title.

It's obvious that Joseph didn't make a mistake. I mean... I'm the stupid one here that's learning. Anybody's willing to give me a hand? I'm having a blast learning C# and Unity.

Here's the code:

 using UnityEngine;
 using System.Collections;
 public class Rayshoot : MonoBehaviour {
     private Camera _camera;
     void Start() {
         _camera = GetComponent<Camera>();
 
         Cursor.lockState = CursorLockMode.Locked;
         Cursor.visible = false;
     }
 
     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), "*");
     }
 
     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)) {
                 GameObject hitObject = hit.transform.gameObject;
                 ReactiveTarget target = hitObject.GetComponent<ReactiveTarget>();
                 if (target != null) {
                     Debug.Log("Target hit");
                 } else {
                     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);
     }
 }