(Unity) Photon join game multiple parameter errors

So I am creating a multiplayer game with photon, following this tutorial: https://www.youtube.com/watch?v=93SkbMpWCGo&ab_channel=Blackthornprod

And I've reached step 5 (6-7 min) where I started to receive errors. To be specific 4 errors:

Assets\scripts\Multiplayer\CreateAndJoinRooms.cs(7,14): error CS0101: The namespace '<global namespace>' already contains a definition for 'CreateAndJoinRooms'
Assets\scripts\Multiplayer\CreateAndJoinRooms.cs(13,17):error CS0111: Type 'CreateAndJoinRooms' already defines a member called 'CreateRoom' with the same parameter types
Assets\scripts\Multiplayer\CreateAndJoinRooms.cs(18,17):error CS0111: Type 'CreateAndJoinRooms' already defines a member called 'JoinRoom' with the same parameter types
Assets\scripts\Multiplayer\CreateAndJoinRooms.cs(23,26):error CS0111: Type 'CreateAndJoinRooms' already defines a member called 'OnJoinedRoom' with the same parameter types

Here is my code:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using Photon.Pun;

public class CreateAndJoinRooms : MonoBehaviourPunCallbacks
{
    public InputField createInput;
    public InputField joinInput;

    public void CreateRoom()
    {
        PhotonNetwork.CreateRoom(createInput.text);
    }

    public void JoinRoom()
    {
        PhotonNetwork.JoinRoom(joinInput.text);
    }

    public override void OnJoinedRoom()
    {
        PhotonNetwork.LoadLevel("TestGame");
    }
}