GameManager class doesn't accept GameObject.Find()

Hi All! I'm makeing a little game in a 3D village with 2D interior scenes (one for each building)... I'm starting with a GameManager componnent to manage the global members and methods like StartNewGame(), LoadGame(), SetGlobalVolume() and memebr like xPosition, yPosition, GameObjects[] arrayOfFoundObjects ecc.. All that after a little Intro scene that is a 10 seconds video (cam animation). When video is finished, there is a call to:

 Application.LoadLevel ("Village");
 
 DontDestroyOnLoad (GameManager.Instance);
 GameManager.Instance.StartState ();
 

So, after the Intro i have the: public void StartState () {...} in which i have the member: Transform player; that in StartState() i have to set its value to: GameObject.Find ("Player").transform; so i can disable the MouseLook and the Camera components of the Player (FPS Input Controller) to stop the player and show the main menu.

The Unity compiler give me that error:

NullReferenceException: Object reference not set to an instance of an object GameManager.StartState () (at Assets/Scripts/GameManager.cs:39)

where the line is:

GameObject.Find ("Player").transform.GetComponent().enabled = false;

What can I do?

Thanks in advance

PS The GameManager is instantiated in the Village scene where i have the Player object and not in the Intro scene.