Hi, I am getting error of Unknown renderer type 
as
Before it was working good. I think after recent update on google chart it 
cause issue.
Please have a look to my code and help me to debug it.

google.charts.setOnLoadCallback();
var data = google.visualization.arrayToDataTable(data_res.data);
 var options = {
 chart: {
   title: '',
   subtitle: '',
 },
  colors: 
['#050896','#468A3D','#E67712','#1962AA','#89519C','#D94810','#A72B4E','#6765C5','#212529'],
   bars: 'vertical' // Required for Material Bar Charts.
 };
 var chart = new 
google.charts.Bar(document.getElementById('barchart_material'));
 chart.draw(data, google.charts.Bar.convertOptions(options));

in data_res.data I am getting json resonse like,
"message": [
    [
      "Months",
      "2016-2017",
      "2017-2018",
      "2018-2019",
      "2019-2020"
    ],
    [
      "August",
      33,
      159,
      161,
      87
    ],
    [
      "September",
      46,
      179,
      154,
      105
    ],
    [
      "October",
      45,
      199,
      147,
      116
    ],
    [
      "November",
      49,
      188,
      143,
      117
    ],
    [
      "December",
      45,
      187,
      139,
      114
    ],
    [
      "January",
      59,
      186,
      134,
      116
    ],
    [
      "February",
      87,
      183,
      135,
      110
    ],
    [
      "March",
      104,
      170,
      132,
      0
    ],
    [
      "April",
      99,
      167,
      126,
      0
    ],
    [
      "May",
      86,
      164,
      108,
      0
    ],
    [
      "June",
      11,
      9,
      4,
      0
    ],
    [
      "July",
      4,
      8,
      2,
      0
    ]
  ]

Please check and give me any solution

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