MainCamera not working if I set: SetActive(true);

Unity Engine
1 
using UnityEngine;
using System.Collections;

public class NetworkManager : MonoBehaviour {

    public Camera standByCamera;
    SpawnSpot[] spawnSpots;
  
    void Start(){
        spawnSpots = GameObject.FindObjectsOfType<SpawnSpot>();
        Connect();
    }

    void Connect(){
        PhotonNetwork.ConnectUsingSettings("Distructor 1.0");
    }

    void OnGUI(){
        GUILayout.Label(PhotonNetwork.connectionStateDetailed.ToString());
    }

    void OnJoinedLobby(){
        Debug.Log ("OnJoinedLobby");
        PhotonNetwork.JoinRandomRoom();
    }

    void OnPhotonRandomJoinFailed(){
        Debug.Log ("OnPhotonRandomJoinFailed");
        PhotonNetwork.CreateRoom (null);
    }

    void OnJoinedRoom(){
        Debug.Log ("OnJoinedRoom");
        SpawnMyPlayer();
    }

    void SpawnMyPlayer(){
        if(spawnSpots == null){
            Debug.LogError ("WTF?!");
            return;
        }
        SpawnSpot mySpawnSpot = spawnSpots[Random.Range (0, spawnSpots.Length)];
        GameObject myPlayerGO = (GameObject)PhotonNetwork.Instantiate("PlayerController", mySpawnSpot.transform.position, mySpawnSpot.transform.rotation, 0);
        standByCamera.enabled = false;
        ((MonoBehaviour)myPlayerGO.GetComponent ("FPSInputController")).enabled = true;
        ((MonoBehaviour)myPlayerGO.GetComponent ("MouseLook")).enabled = true;
        myPlayerGO.transform.FindChild ("Main Camera").gameObject.SetActive (true);
    }
}

In the Unity the camera on the child of CharacterController is disabled.
So this code:

myPlayerGO.transform.FindChild ("Main Camera").gameObject.SetActive (true);

Must work!!! But didn’t work!

2

Sorry. I realized which is the problem!!
Please close the thread.
Thanks!