Bookmark Creating Rooms With Random Gives me an Error

i cant understand what kind of error message is that mean .. & and whats wrong with my Code .
Any Help Please ?

My Code :
using Photon.Pun;
using Photon.Realtime;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class Chating : MonoBehaviourPunCallbacks
{
int y=10;
public InputField Input_Player_Name;
public InputField Input_ActorNumber;
string player_Name;
int actorNumber;
Player player;
RoomOptions rm;
string RoomName="Test";

public void OnkButtonClicked ()
{
PhotonNetwork.ConnectUsingSettings();
player_Name = Input_Player_Name.text;
actorNumber = int.Parse(Input_ActorNumber.text);
player = new Player(player_Name, actorNumber, true);
player.UserId = actorNumber.ToString() ;



}
void OnGUI()
{
GUI.Label(new Rect(0, 10, 400, 500+y), PhotonNetwork.NetworkClientState.ToString());
y += 5;
}

public override void OnConnectedToMaster ()
{
Debug.Log("Connected To : " + PhotonNetwork.NetworkClientState.ToString());
PhotonNetwork.JoinLobby(TypedLobby.Default);
}
public override void OnJoinedLobby()
{
Debug.Log("Was Joined To Lobby .....and he is Master Client");
rm = new RoomOptions() { IsVisible = true, IsOpen = true, MaxPlayers = 2 };
for (int num = 0; num < 10; num++)
{
RoomName = "Test" + Random.Range(1, 1000);
PhotonNetwork.JoinOrCreateRoom(RoomName , rm, TypedLobby.Default, null);
}
}
public override void OnCreatedRoom()
{
Debug.Log("Room Was Created .....");
PhotonNetwork.JoinRoom(RoomName,null);
}
public override void OnJoinRoomFailed(short ss, string st)
{
Debug.Log("Room Was Not Joined .....");
PhotonNetwork.JoinRoom(RoomName);
}
public override void OnJoinedRoom ()
{
Debug.Log("Room Was Joined ......");
}

}



Error Massage Was like That :
JoinRoom failed. Client is on GameServer (must be Master Server for matchmaking) and ready. Wait for callback: OnJoinedLobby or OnConnectedToMaster.