The name `OnConnect' does not exist in the current context

I got some code for automatically joining matchmaking from StackExchange and when I tested it, it said "The name `OnConnect' does not exist in the current context". (I changed from MonoBehaviour to NetworkBehaviour too.) Here it is:

 using UnityEngine;
 using UnityEngine.Networking;
 using UnityEngine.Networking.Match;
 using UnityEngine.Networking.Types;
 using System.Collections;
 using System.Collections.Generic;
 
 public class GameLoader : NetworkBehaviour {
     bool done;
     // Use this for initialization
     void Start () {
         NetworkManager.singleton.StartMatchMaker();
         NetworkManager.singleton.matchMaker.ListMatches(0, 20, "Match", false, 0, 1, OnMatchList);
         Debug.Log("Searching");
     }
 
     public virtual void OnMatchList(bool success, string extendedInfo, List<MatchInfoSnapshot> matchList)
     {
         if (success)
         {
             if (matchList.Count != 0)
             {
                 Debug.Log("Matches Found");
                 NetworkManager.singleton.matchMaker.JoinMatch(matchList[0].networkId, "", "", "", 0, 1, OnMatchJoined);
             }
             else
             {
                 Debug.Log("No Matches Found");
                 Debug.Log("Creating Match");
                 NetworkManager.singleton.matchMaker.CreateMatch("Match", 2, true, "", "", "", 0, 1, OnMatchCreate);
             }
         }
         else
         {
             Debug.Log("ERROR : Match Search Failure");
         }
     }
 
     public virtual void OnMatchJoined(bool success, string extendedInfo, MatchInfo matchInfo)
     {
         if (success)
         {
             Debug.Log("Match Joined");
             MatchInfo hostInfo = matchInfo;
             NetworkManager.singleton.StartClient(hostInfo);
 
             OnConnect();
         }
         else
         {
             Debug.Log("ERROR : Match Join Failure");
         }
 
     }
 
     public virtual void OnMatchCreate(bool success, string extendedInfo, MatchInfo matchInfo)
     {
         if (success)
         {
             Debug.Log("Match Created");
 
             MatchInfo hostInfo = matchInfo;
             NetworkServer.Listen(hostInfo, 9000);
             NetworkManager.singleton.StartHost(hostInfo);
 
             OnConnect();
         }
         else
         {
             Debug.Log("ERROR : Match Create Failure");
         }
     }
 }

It's "OnConnect();" That calls an error.