CreateRoom failed.

Questions & Answers
1

I’m trying to create a room, but I’m having an error. Where is the problem?

using Photon.Pun;
using Photon.Realtime;
using System.Collections;
using System.Collections.Generic;
using TMPro;
using UnityEngine;

public class Connect : MonoBehaviourPunCallbacks
{
    [SerializeField] private GameObject connectingPanel;
    [SerializeField] private GameObject createRoomPanel;
    [SerializeField] private GameObject startGamePanel;
    [SerializeField] private GameObject adversaryPanel;

    [SerializeField] private TextMeshProUGUI mainServerText;
    [SerializeField] private TextMeshProUGUI mainUserText;

    [SerializeField] private TextMeshProUGUI otherServerText;
    [SerializeField] private TextMeshProUGUI otherUserText;

    [SerializeField] private TextMeshProUGUI infoServerText;

    private bool isConnecting = false;

    private const string gameVersion = "0.1";
    private const int maxPlayersPerRoom = 2;

    [SerializeField] int correntNumber = 0;
    public void CreateServer()
    {
        createRoomPanel.SetActive(false);
        connectingPanel.SetActive(true);

        isConnecting = true;

        PhotonNetwork.ConnectUsingSettings(gameVersion);

        CreateARoom();

    }

    public void CreateARoom() 
    {
        RoomOptions roomOptions = new RoomOptions();
        roomOptions.IsVisible = true;
        roomOptions.MaxPlayers = 2;
        PhotonNetwork.CreateRoom(mainServerText.text, roomOptions, TypedLobby.Default);
        correntNumber = 1;
    }
     public void JoinARoom()
    {
        PhotonNetwork.JoinRoom(mainServerText.text);
        correntNumber = 2;
    }
    public override void OnJoinedRoom()
    {
       
        int playerCount = PhotonNetwork.CurrentRoom.PlayerCount;
        Debug.Log(playerCount.ToString());
        if (playerCount != maxPlayersPerRoom)
        {
            infoServerText.text = "Waiting for the opponent...";
        }
        else
        {
            infoServerText.text = "You are connected!";

            if (correntNumber == 1)
            {
                connectingPanel.SetActive(false);
                 startGamePanel.SetActive(true);
            }
            else if (correntNumber == 2)
            {
                connectingPanel.SetActive(false);
                adversaryPanel.SetActive(true);
            }


        }
    }

}

Erro: CreateRoom failed. Client is on MasterServer (must be Master Server for matchmaking)but not ready for operations (State: ConnectingToNameServer). Wait for callback: OnJoinedLobby or OnConnectedToMaster.

2

The problem is that you have to wait for photon to acutally connect to the cloud service before you can actually open a room.

So there is a callback in the interface IConnectionCallbacks called OnConnectedToMaster which will be your point where you can start joining and/or opening rooms.
You are just doing stuff too early.