ajax Get Method Error? Uncaught SyntaxError: Unexpected token <

function GetData() {
    var url = "http://localhost:60191/SampleService.asmx/SayHello";
    $.ajax({
        type: 'GET',
        url: url,
        crossDomain: true,
        contentType: "application/json; charset=utf-8",
        //data: "{firstName:'Aidy', lastName:'F'}",
        dataType: "jsonp",
        timeout: 4000,
        async: false,
        success: function (data) {
            debugger;

            var aa = JSON.parse(data);
            alert(data);
            $.each(msg, function (name, value) {
                alert(value);
                console.log(data.data);
            });
        },
        error: function (xhr, status, error) { alert('error 404 !!'); },
        async: false,
        cache: false
    });
}