[Solved] jQuery Ajax Error: Authentication failed

When i run the code above it gives me an alert. It says undefined

Error: Authentication failed

<script type="text/javascript">
    google.load("visualization", "1", { packages: ["corechart"] });
    google.setOnLoadCallback(drawChart);
    function drawChart() {
        var options = {
            title: 'Number Of Resources',
            width: 600,
            height: 400,
            bar: { groupWidth: "95%" },
            legend: { position: "none" },
            isStacked: true
        };
        $.ajax({
            type: "POST",
            url: "dashboard/GetChartData",
            data: '{}',
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function (r) {
                var data = google.visualization.arrayToDataTable(r.d);
                var chart = new google.visualization.PieChart($("#chart")[0]);
                chart.draw(data, options);
            },
            failure: function (r) {
                alert(r.d);
            },
            error: function (r) {
                alert(r.d);
            }
        });
    }
</script>