Ajax and WebMethod Function are not in sync

[Philosophaie]

Ajax and WebMethod Function are not in sync.

Ignoring the json input and testing if the string gets past gives this error:

Error Code:[object Object] Status: 401 Ex: Unauthorized

Here is my Webmethod and we are ignoring mo, dy and yr as a json input:

Imports System.IO
Imports System.Web.Services

Public Class _Default
    Inherits Page

    <WebMethod()>
    Public Shared Function GetDate(mo As Integer, dy As Integer, yr As Integer) As String
        Return "Test"
    End Function
End Class

This is my Ajax call. I have the exact same code in C# and it works as prescribed:

    <script type="text/javascript" src="~/jquery=1.10.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            $("#<%= Button1.ClientID %>").click(function () {
                var mo1 = $("#<%= TextBox1.ClientID %>").val();
                var dy1 = $("#<%= TextBox2.ClientID %>").val();
                var yr1 = $("#<%= TextBox3.ClientID %>").val();
                var data = { mo: mo1, dy: dy1, yr: yr1 };
                var json1 = JSON.stringify(data); 
                $.ajax
                ({
                    type: "POST",
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    data: json1,
                    url: "Default.aspx/GetDate",
                    success: function (result) {
                        $("#<%= TextBox4.ClientID %>").val(result.d);
                    },
                        error: function (status, ex) {
                            alert("Error Code:" + status + "Status: " + status.status + " Ex: " + status.statusText);
                    }
                });
                return false;
            });
        });
    </script>