Player name in multiplayer game big problem

Hi i have problem with player name in multiplayer game. In network manager when spawning i set player name in playerdata script and then i want to get string from that script and put it into 3dText. Unfortunetly the 3dText text is empty when getting data from that script.... i have no idea how to achieve that. Parts of my scripts:

spawn in network manager

Code (csharp):

1.  
2. void SpawnMyPlayer() {
3.         AddChatMessage("Spawning player: " + PhotonNetwork.player.name);
4.  
5.         playerName = PhotonNetwork.player.name;
6.  
7.         SpawnSpot mySpawnSpot = spawnSpots[ Random.Range (0, spawnSpots.Length) ];
8.         GameObject myPlayerGO = (GameObject)PhotonNetwork.Instantiate("PlayerController", mySpawnSpot.transform.position, mySpawnSpot.transform.rotation, 0);
9.         standbyCamera.SetActive(false);
10.  
11.         ((MonoBehaviour)myPlayerGO.GetComponent("BetaMovement")).enabled = true;
12.         myPlayerGO.GetComponent<PlayerData> ().playerName = PhotonNetwork.player.name.ToString ();
13.                 ............................
14.     }
15.  

update in player data

when i comment this line the text set in editor is displayed

Code (csharp):

1.  
2. void Update () {
3.         transform.FindChild ("Name").GetComponent<TextMesh> ().text = playerName;
4.     }
5.  

 

anyone any idea?