vb.net WebSocket4Net with proxy or socks5

Question

I use vb.net trying connect websocket with proxy

 websocket = New WebSocket(compSocketURL & token, "", cook, , useragent, gencmd("origin"), WebSocketVersion.Rfc6455) 'WebUtility.UrlEncode(token)
            Dim myProxy As New WebProxy("118.70.126.245:5678")
            websocket.Proxy = myProxy

            AddHandler websocket.Opened, Sub(s, e) socketOpened(s, e)
            AddHandler websocket.Error, Sub(s, e) socketError(s, e)
            AddHandler websocket.Closed, Sub(s, e) socketClosed(s, e)
            AddHandler websocket.MessageReceived, Sub(s, e) socketMessage(s, e)
            'AddHandler websocket.DataReceived, Sub(s, e) socketDataReceived(s, e)

            websocket.Open()

I got this error while running

Is there any solution for help.

Thank you.