I'm trying to generate a random key and share it with other players using RPC.

This is the code that i'm currently using, i've tried may different logic but it's no use. Can someone please point out the problem? i think i'm using the RPC wrong.

public class GeneratingKey : Photon.MonoBehaviour {
int random;
string key = null;
string RandomKey = "";
void Start() {
if(PhotonNetwork.countOfPlayers == 1 && key == null)
{
for (int i = 0; i < 30; i++) {
random = Random.Range (1, 5);
RandomKey = RandomKey + random.ToString();
}
key = RandomKey;
}
if (key != null) {
ProceduralNumberGenerator.SetKey (key);
}
}
void Update(){
photonView.RPC ("SetKey", PhotonTargets.Others, key);
if (key != null)
Debug.Log (key);
ProceduralNumberGenerator.SetKey (key);
}
// Update is called once per frame
[PunRPC]
void SetKey (string tempString) {
if (key == null) {
key = tempString;
}
}
}