Problem with the line

Many thanks. I have these codes

    <link rel="stylesheet" type="text/css" href="http://ift.tt/1c3Zbe3; />
    <script src="http://ift.tt/1f0kuBr;
    <script type="text/javascript" src="http://ift.tt/1dqbljI;
    <script type="text/javascript">
        $(function () {
            $.ajaxSetup({ cache: false });

            UpdateDatabase();

            setInterval(UpdateDatabase, 60000);
        });
        function UpdateDatabase() {
            PageMethods.UpdateDatabase($('#lb_var1').text())
        }
        ...
        [WebMethod]
        public static void UpdateDatabase(string iteabbr)
        {
            using (var sqlConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["Mssqlconn2"].ConnectionString))
            {
                sqlConnection.Open();

                var query = "UPDATE ite_master SET polling_time= @LastSeen WHERE ite_abbr = @iteabbr";

                using (var sqlCommand = new SqlCommand(query, sqlConnection))
                {
                    sqlCommand.Parameters.AddWithValue("@LastSeen", DateTime.Now);
                    sqlCommand.Parameters.AddWithValue("@iteabbr", iteabbr);

                    sqlCommand.ExecuteNonQuery();
                }
            }
        }

but I do get this error due to PageMethods. why?

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Many Thanks & Best Regards, Hua Min