FuelPHP Forums

i am fuelphp begineer.I want to create line chart in ajax.i write this code
docs/general/controllers/rest.html
   <link href="/assets/js/nvd3/src/nv.d3.css" >
    <script src="/assets/js/nvd3/lib/d3.v3.js"></script>
    <script src="/assets/js/nvd3/nv.d3.js"></script>
    <script src="/assets/js/nvd3/src/tooltip.js"></script>
    <script src="/assets/js/nvd3/src/utils.js"></script>
    <script src="/assets/js/nvd3/src/interactiveLayer.js"></script>
    <script src="/assets/js/nvd3/src/models/legend.js"></script>
    <script src="/assets/js/nvd3/src/models/axis.js"></script>
    <script src="/assets/js/nvd3/src/models/line.js"></script>
    <script src="/assets/js/nvd3/src/models/lineChart.js"></script>
   <div id="chart"><svg></svg></div>
<script>
$(function() {
    $("#datepicker").datepicker();
    $('#timepicker').timepicker({'step':1, 'timeFormat': 'H:i' });
    var chart;
    var data = [{
            key: "CPU",
            color: "orange",
            values: [],
            area: true
    }];
    nv.addGraph(function() {
      chart = nv.models.lineChart();
      chart.x(function(d,i) { return d.x; });
      chart.showXAxis(true)
           .showYAxis(true)
           .rightAlignYAxis(true)
           .margin({right: 90});
      chart.xAxis
          .tickFormat(d3.format(',.0f'))
          .axisLabel("Time");
      chart.yAxis
          .axisLabel('Percentage (%)')
          .tickFormat(d3.format(',.0f'));
      d3.select('#chart svg')
          .datum(data)
        .transition().duration(500)
          .call(chart);
      chart.forceY([0,100]);
       return chart;
    });
    function refresh() {
        $.ajax({
          url: "/instance/aseMonitorServer_cpu",
          type: "post",
          dataType: "json",
          data: { arg1: 123 },
          success: function(values) {
            data[0].values = values;
            chart.update();
          }
        });
    }
    refresh();
 });
fuel/app/class/controller
<?php
class Controller_Instance extends Controller_Rest {
    function post_aseMonitorServer_cpu()
    {
        $data = \DB::query("select sample_at as x, cpu_busy as y
                              from ase_monitorServer
                              where cpu_busy is not null
                              and sample_at between 1382400000 and 1382430520
                              order by sample_at
                              limit 100")
                ->execute()
                ->as_array();
        return $this->response($data);
    }
}
i get this error.please help me!!.thank you.