Reference for Signalr/hubs is getting an error

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I'm trying to use signalr library to create a website in Asp.Net and SignalR is working in web project but not working in website.

When i hit the url of localhost:60891/signalr/hubs,i'm getting this error "An item with the same key has already been added". Here is my code .cs file :-

     using System;
     using System.Collections.Generic;
     using System.Linq;
     using System.Web;
     using Microsoft.AspNet.SignalR;
     using Signal R Chat.Common;

     namespace Signal R Chat
     {
public class ChatHub : Hub
{
    #region Data Members

    static List<UserDetail> Connected Users = new List<UserDetail>();
    static List<MessageDetail> Current Message = new List<MessageDetail>();

    #endregion

    #region Methods

    public void Connect(string userName)
    {
        var id = Context.ConnectionId;


        if (Connected Users.Count(x => x.ConnectionId == id) == 0)
        {
            Connected Users.Add(new UserDetail { ConnectionId = id, UserName = userName   });

            // send to caller
            Clients.Caller.onConnected(id, userName, Connected Users, Current Message);

            // send to all except caller client
            Clients.All Except(id).on NewUser Connected(id, userName);

        }

    }

    public void Send Message To All(string userName, string message)
    {
        // store last 100 messages in cache
        Add Message inCache(userName, message);

        // Broad cast message
        Clients.All.messageReceived(userName, message);
    }

    public void Send Private Message(string to UserId, string message)
    {

        string from UserId = Context.ConnectionId;

        var to User = Connected Users.FirstOrDefault(x => x.ConnectionId == to UserId) ;
        var fromUser = Connected Users.FirstOrDefault(x => x.ConnectionId == from  UserId);

        if (to User != null && fromUser!=null)
        {
            // send to 
            Clients.Client(to User Id).send Private Message(from UserId, from  User.UserName, message); 

            // send to caller user
            Clients.Caller.send Private Message(to UserId, from User.UserName, message); 
        }

    }

    public override System.Threading.Tasks.Task OnDisconnected()
    {
        var item = Connected Users.FirstOrDefault(x => x.ConnectionId ==   Context.ConnectionId);
        if (item != null)
        {
            Connected Users.Remove(item);

            var id = Context.ConnectionId;
            Clients.All.onUserDisconnected(id, item.UserName);

        }

        return base.OnDisconnected();
    }


    #endregion

    #region private Messages

    private void AddMessageinCache(string userName, string message)
    {
        CurrentMessage.Add(new MessageDetail { UserName = userName, Message = message  });

        if (CurrentMessage.Count > 100)
            CurrentMessage.RemoveAt(0);
    }

    #endregion
    }

    }

asked 4 mins ago

user3449773

1