Error

error:
Assets/Scripts/Network/Menu.cs(81,25): error CS0246: The type or namespace name `Player' could not be found. Are you missing a using directive or an assembly reference?

using UnityEngine;
using System.Collections;

public class Menu : MonoBehaviour {

	private string CurMenu;
	public string Name;
	public string MatchName;
	public int Players;
	// Use this for initialization
	void Start () {
		CurMenu = "Main";
		Name = PlayerPrefs.GetString("PlayerName");
	}

	// Update is called once per frame
	void Update () {

	}

	void ToMenu(string menu){
		CurMenu = menu;
	}
	void OnGUI(){
		if (CurMenu == "Main")
			Main();
		if (CurMenu == "Host")
			Host();
		if (CurMenu == "Lobby")
			Lobby();
		if (CurMenu == "List")
			MatchList();
	}
	private void Main(){

Error:(Sending RPC 'Client_PlayerJoined' failed because the number of supplied parameters doesn't match the rpc declaration. Expected 2 but got 3 parameters
.
using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class NetworkManager : MonoBehaviour
{
	public string PlayerName;
	public string MatchName;
	public static NetworkManager Instance;
	public List<Player>PlayerList = new List<Player>();
	public Player MyPlayer;

	// Use this for initialization
	void Start () {
		Instance = this;
		DontDestroyOnLoad(gameObject);
	}

	// Update is called once per frame
	void Update () {
		PlayerName = PlayerPrefs.GetString("PlayerName");

	}

	public void StartServer(string ServerName, int MaxPlayers)
	{
		Network.InitializeSecurity();
		Network.InitializeServer (MaxPlayers, 25565, true);
		MasterServer.RegisterHost("Tut", ServerName, "");

		Debug.Log("Started Server");
	}
	void OnPlayerConnected(NetworkPlayer id)
	{
		//networkView.RPC ("Server_PlayerJoined", RPCMode.Server, PlayerName, id);
		foreach (Player pl in PlayerList)
		{
			networkView.RPC("Client_PlayerJoined",id,pl.PlayerName, pl.OnlinePlayer);
		}
	}

	void OnServerInitialized()
	{
		Server_PlayerJoined (PlayerName, Network.player);
	}

	void OnConnectedToServer()
	{
		networkView.RPC ("Server_PlayerJoined", RPCMode.All, PlayerName, Network.player);
	}

	[RPC]
	public void Server_PlayerJoined(string Username,NetworkPlayer id)
	{
		networkView.RPC("Client_PlayerJoined", RPCMode.All,PlayerName,Username, id);
	}

	[RPC]
	public void Client_PlayerJoined(string Username,NetworkPlayer id)
	{
		Player temp = new Player();
		temp.PlayerName = Username;
		temp.OnlinePlayer = id;
		PlayerList.Add(temp);
		if (Network.player == id)
		{
			MyPlayer = temp;
		}
	}

[System.Serializable]
public class Player{
	public string PlayerName;
	public NetworkPlayer OnlinePlayer;
	}
}