spawn prefab problem in multiplayer game

Hi all ! , I have a problem in my game when I instantiate a player.Client don't init the player who is instantiated before.
I still see that code folow :

Code (csharp):

1. function OnNetworkLoadedLevel ()
2. {
3.     Network.Instantiate(playerPrefab, transform.position, transform.rotation, 0);
4. }

and call in function Awake :

Code (csharp):

1.        
2. for (var go : GameObject in FindObjectsOfType(GameObject)){
3.             go.SendMessage("OnNetworkLoadedLevel", SendMessageOptions.DontRequireReceiver);
4.         }
5.  
6.  

i don't understand this code , help me please !