SendGrid SMTP Send Mail Message .Net

I am getting the following message on my ReplyTo line below.

Value of type 'MailAddress' cannot be converted to 'MailAddress()'.
Without that mail sends perfectly fine however.

Little help?

            Dim recipients As New List(Of [String])() From {Emailx + ""}
            Dim customArgs As New Dictionary(Of String, String)()
            customArgs.Add("campaign_id", "ewCID9999")
            customArgs.Add("Customer_ID", "ewCUSID123")

            Dim myMessage = New SendGridMessage()
            myMessage.AddTo(recipients)
            myMessage.From = New MailAddress(fromAddress) 'fromAddress
            Dim tReply = New MailAddress("myaddress@mydomain.com")

            myMessage.Subject = "TEST NEW USER"
            myMessage.Html = "TEST HTML <br /><br /><br />LB"
            myMessage.AddUniqueArgs(customArgs)
            myMessage.ReplyTo = tReply
            Dim credentials = New NetworkCredential(sgUsername, sgPassword)
            ' Create a Web transport for sending email.
            Dim transportWeb = New Web(credentials)

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