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I don’t know what to do.I’d appreciate it if you could help me.Part of my code is as follows

option = {
  legend: {},
  tooltip: {},
  dataset: {
    source: [
      ['product', '2015', '2016'],
      ['Matcha Latte', 43.3, 85.8],
      ['Milk Tea', 83.1, 73.4],
      ['Cheese Cocoa', 86.4, 65.2],
      ['Walnut Brownie', 72.4, 53.9]
    ]
  },
  xAxis: { type: 'category' },
  yAxis: {},
  // Declare several bar series, each will be mapped
  // to a column of dataset.source by default.
  series: [{ type: 'bar' }, { type: 'bar' }]
};