Google pie chart not working for me

<script type="text/javascript">

      // VISUALIZATION API AND THE PIE CHART PACKAGE.
      google.load("visualization", "1", { packages: ["corechart"] });

      google.setOnLoadCallback(createPIE);
      

      function createPIE() {
          var options = {
              title: 'Downtime Analysis',
              colors: ['#888', 'orange'],
              is3D: true
          };
          //alert("");
          $.ajax({
              url: "webmethod.aspx/GetpieChartweb",
              dataType: "json",
              type: "POST",
              contentType: "application/json; charset=utf-8",
              success: function(jsonData) {
              var data = new google.visualization.DataTable();
              
                  // assumes "word" is a string and "count" is a number
                  data.addColumn('string', 'Text');
                  data.addColumn('number', 'Value');
                  // CREATE A DataTable AND ADD THE ARRAY (WITH DATA) IN IT.
                  //var figures = google.visualization.arrayToDataTable(arrValues)

                  // THE TYPE OF CHART (PieChart IN THIS EXAMPLE).
                  // var chart = new google.visualization.PieChart(document.getElementById('divpiechart'));
                  var len = jsonData.d.length;
                  // alert(len);
                  for (var i = 0; i < len; i++) {
                      alert(i);
                      //data.addRow([jsonData[i].Text, jsonData[i].value]);
                      data.addRow([jsonData[i].Text, jsonData[i].Value]); // error in this line 
                      //alert([jsonData[i].Text]); this alert not come
                  }
                  var chart = new google.visualization.PieChart(document.getElementById('divpiechart'));
                  chart.draw(data, options);             // DRAW GRAPH WITH THE DATA AND OPTIONS.

              },
              error: function(XMLHttpRequest, textStatus, errorThrown) {
                  alert('Got an Error');
              }
          });
      }
</script>