'UnityEngine.Networking.Match.MatchDesc' is inaccessible due to its protection level (CS0122) (Assembly-CSharp)

I just copied an example of a matchmaker script from Unity manual (wich is actually pasted below), but MonoDevelop points on a mistake "is inaccessible due to its protection level (CS0122) " and on "Error CS0052: Inconsistent accessibility". I changed literally nothing, just attempted to compile an example code. How to solve it? using UnityEngine; using UnityEngine.Networking; using UnityEngine.Networking.Types; using UnityEngine.Networking.Match; using System.Collections.Generic;

 public class HostGame : MonoBehaviour
 {
     List<MatchDesc> matchList = new List<MatchDesc>(); /* First cs0122 error + Error CS0052: Inconsistent accessibility: field type 'System.Collections.Generic.List<UnityEngine.Networking.Match.MatchDesc>' is less accessible than field 'HostGame.matchList' (CS0052) (Assembly-CSharp)*/
     bool matchCreated;
     NetworkMatch networkMatch;
 
     void Awake()
     {
         networkMatch = gameObject.AddComponent<NetworkMatch>();
     }
 
     void OnGUI()
     {
         // You would normally not join a match you created yourself but this is possible here for demonstration purposes.
         if(GUILayout.Button("Create Room"))
         {
             CreateMatchRequest create = new CreateMatchRequest();
             create.name = "NewRoom";
             create.size = 4;
             create.advertise = true;
             create.password = "";
 
             networkMatch.CreateMatch(create, OnMatchCreate);
         }
 
         if (GUILayout.Button("List rooms"))
         {
             networkMatch.ListMatches(0, 20, "", OnMatchList);
         }
 
         if (matchList.Count > 0)
         {
             GUILayout.Label("Current rooms");
         }
         foreach (var match in matchList)
         {
             if (GUILayout.Button(match.name))
             {
                 networkMatch.JoinMatch(match.networkId, "", OnMatchJoined);
             }
         }
     }
 
     public void OnMatchCreate(CreateMatchResponse matchResponse) //Second error(a combination of two previous) 
     {
         if (matchResponse.success)
         {
             Debug.Log("Create match succeeded");
             matchCreated = true;
             Utility.SetAccessTokenForNetwork(matchResponse.networkId, new NetworkAccessToken(matchResponse.accessTokenString));
             NetworkServer.Listen(new MatchInfo(matchResponse), 9000);
         }
         else
         {
             Debug.LogError ("Create match failed");
         }
     }
 
     public void OnMatchList(ListMatchResponse matchListResponse) //third error
     {
         if (matchListResponse.success && matchListResponse.matches != null)
         {
             networkMatch.JoinMatch(matchListResponse.matches[0].networkId, "", OnMatchJoined);
         }
     }
 
     public void OnMatchJoined(JoinMatchResponse matchJoin)
     {
         if (matchJoin.success)
         {
             Debug.Log("Join match succeeded");
             if (matchCreated)
             {
                 Debug.LogWarning("Match already set up, aborting...");
                 return;
             }
             Utility.SetAccessTokenForNetwork(matchJoin.networkId, new NetworkAccessToken(matchJoin.accessTokenString));
             NetworkClient myClient = new NetworkClient();
             myClient.RegisterHandler(MsgType.Connect, OnConnected);
             myClient.Connect(new MatchInfo(matchJoin));
         }
         else
         {
             Debug.LogError("Join match failed");
         }
     }
 
     public void OnConnected(NetworkMessage msg)
     {
         Debug.Log("Connected!");
     }
 }