I am having a problem with the following script

I have followed a tutorial on youtube (here is the link) and when I test my progress so far at 26:00, I get an error. The error is Error CS0246, 'MultiplayerManager could not be found. Are you missing a using directive or an assembly reference. The code is as follows:

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class MultiPlayerManager : MonoBehaviour 
 {
     public static MultiplayerManager instance;
     
     public string PlayerName;
     
     private string MatchName = "";
     private string MatchPassword  = "";
     private int MatchMaxUsers = 32;
     
     public List<MPPlayer> PlayerList = new List<MPPlayer>();
     
     void Start()
     {
         instance = this;
     }
     
     public void StartServer(string servername, string serverpassword, int maxusers) 
     {
         MatchName = servername;
         MatchPassword = serverpassword;
         MatchMaxUsers = maxusers;
         Network.InitializeServer(MatchMaxUsers, 2550, false);
         Network.InitializeSecurity();
     }
     
     void OnServerInitialized()
     {
         Server_PlayerJoinRequest("", Network.player);    
     }    
         
     void OnConnectedToServer()
     {
         networkView.RPC("Server_PlayerJoinRequest", RPCMode.Server,"", Network.player);        
     }
     
     void OnPlayerDisconnected(NetworkPlayer id)
     {
         networkView.RPC("Clent_RemovePlayer", RPCMode.All, id);    
     }
     
     [RPC]
     void Server_PlayerJoinRequest(string playername, NetworkPlayer view)        
     {
         networkView.RPC("AddPlayerToList", RPCMode.All, playername, view);    
     }
     
     [RPC]
     void Client_AddPlayerToList(string playername, NetworkPlayer view)
     {
         MPPlayer tempplayer = new MPPlayer(); 
         tempplayer.PlayerName = playername;
         tempplayer.PlayerNetwork = view;
         PlayerList.Add(tempplayer);
     }
     
     [RPC]
     void Client_RemovePlayer(NetworkPlayer view)
     {
         MPPlayer temppl = null;
         foreach(MPPlayer pl in PlayerList)
         {
             if (pl.PlayerNetwork == view) 
             {
                 temppl = pl;
             }
         }
         if (temppl != null)
         {
             PlayerList.Remove(temppl);
         }
         
     }
 }
 
 public class MPPlayer
 {
     public string PlayerName = "";
     public NetworkPlayer PlayerNetwork;
 }

The error is at (7,23) well atleast thats what it say,) but I cannot find the problem. Can someone please help me find he problem? Thanks in advance for your help.