Localhost AJAX请求错误

Question

I receive an error when i try to make a AJAX request. The output is

{
    "streams": [
        [],
        { "stream": "stream" },
        { "stream": "hujghg " },
        { "stream": "\/topic\/output.smartlab.550e8400-e29b-41d4-a716-446655440000_temperature" },
        { "stream": "\/topic\/output.sandbox.68a9c757-435f-4c18-8069-135ccc407e59_temperatura" } 

]}

The request code is

function initSmartobject(){
    $.ajax({
        url:"http://127.0.0.1/limpid/php/usersManagement.php?tag=getTopics&id=1",
        dataType: 'jsonp', // Notice! JSONP <-- P (lowercase)
        success:function(json){
            // do stuff with json (in this case an array)
            alert("Success");
        },
        error: function(xhr, status, error) {
            alert('errore');
            var err = eval("(" + xhr.responseText + ")");
            alert(err.Message);
        }
    });
}

err.Message doesn't return anything