How to access a game object that wasn't destroyed on load?

I have a game object: GameManager, that I want to access from all classes. I’ve set it in Start() to not be destroyed on load (here is my start function for gamemanager):

public void Start(){
	DontDestroyOnLoad (this);
	SaveLoad.Save ();
	levelTimes = new float[20];
	SaveLoad.Load ();

But, I can’t seem to access it by using gameobject.Find() in my GUI text class(not an actual GUI text object but my own custom GUI text class) here’s the code for that:

using UnityEngine;
using System.Collections;

public class GUITextScript : MonoBehaviour {
	public float posX; 
	public float posY; 
	public float sizeX;
	public float sizeY;
	Vector3 thisposition;
	GameWideScript gamescript;
	PlayerControl player;
	public string content;

// Use this for initialization
void Start () {	
	gamescript = GameObject.Find ("GameManager").GetComponent<GameWideScript>();
	player = GameObject.Find ("character").GetComponent <PlayerControl>();

It throws a NullReferenceException when I try to get the gamemanager object. WHat am I doing wrong?

Despite the fact that it should work, I often do in the same situation with this:

gamescript = (GameWideScript)FindObjectOfType(typeof(GameWideScript));

and it always works.