Почему не выводятся данные из базового примера vuetify?

new Vue({ 
  el: '#app', 
  vuetify: new Vuetify(), 
  data () { 
      return { 
          expand: false, 
          headers: [ 
              { 
                  text: 'Dessert (100g serving)', 
                  align: 'left', 
                  sortable: false, 
                  value: 'name' 
              }, 
              { text: 'Calories', value: 'calories' }, 
              { text: 'Fat (g)', value: 'fat' }, 
              { text: 'Carbs (g)', value: 'carbs' }, 
              { text: 'Protein (g)', value: 'protein' }, 
              { text: 'Iron (%)', value: 'iron' } 
          ], 
          desserts: [ 
              { 
                  name: 'Frozen Yogurt', 
                  calories: 159, 
                  fat: 6.0, 
                  carbs: 24, 
                  protein: 4.0, 
                  iron: '1%' 
              }, 
              { 
                  name: 'Ice cream sandwich', 
                  calories: 237, 
                  fat: 9.0, 
                  carbs: 37, 
                  protein: 4.3, 
                  iron: '1%' 
              }, 
              { 
                  name: 'Eclair', 
                  calories: 262, 
                  fat: 16.0, 
                  carbs: 23, 
                  protein: 6.0, 
                  iron: '7%' 
              }, 
              { 
                  name: 'Cupcake', 
                  calories: 305, 
                  fat: 3.7, 
                  carbs: 67, 
                  protein: 4.3, 
                  iron: '8%' 
              }, 
              { 
                  name: 'Gingerbread', 
                  calories: 356, 
                  fat: 16.0, 
                  carbs: 49, 
                  protein: 3.9, 
                  iron: '16%' 
              }, 
              { 
                  name: 'Jelly bean', 
                  calories: 375, 
                  fat: 0.0, 
                  carbs: 94, 
                  protein: 0.0, 
                  iron: '0%' 
              }, 
              { 
                  name: 'Lollipop', 
                  calories: 392, 
                  fat: 0.2, 
                  carbs: 98, 
                  protein: 0, 
                  iron: '2%' 
              }, 
              { 
                  name: 'Honeycomb', 
                  calories: 408, 
                  fat: 3.2, 
                  carbs: 87, 
                  protein: 6.5, 
                  iron: '45%' 
              }, 
              { 
                  name: 'Donut', 
                  calories: 452, 
                  fat: 25.0, 
                  carbs: 51, 
                  protein: 4.9, 
                  iron: '22%' 
              }, 
              { 
                  name: 'KitKat', 
                  calories: 518, 
                  fat: 26.0, 
                  carbs: 65, 
                  protein: 7, 
                  iron: '6%' 
              } 
          ] 
      } 
  } 
})

<link href="https://fonts.googleapis.com/css?family=Roboto:100,300,400,500,700,900|Material+Icons" rel="stylesheet"> 
<link href="https://cdn.jsdelivr.net/npm/vuetify/dist/vuetify.min.css" rel="stylesheet"> 
    <div id="app"> 
      <v-app id="inspire"> 
        <v-data-table 
          :headers="headers" 
          :items="desserts" 
          item-key="name" 
          show-expand 
          :single-expand="expand" 
          class="elevation-1" 
        > 
          <template #top> 
            <v-toolbar flat color="white"> 
              <v-toolbar-title>Expandable Table</v-toolbar-title> 
              <v-spacer></v-spacer> 
              <v-btn color="primary" dark @click="expand = !expand"> 
                {{ expand ? 'Close' : 'Keep' }} other rows 
              </v-btn> 
            </v-toolbar> 
          </template> 
          <template #item.expanded="{ headers }"> 
            <td :colspan="headers.length">Peek-a-boo!</td> 
          </template> 
        </v-data-table> 
      </v-app> 
    </div> 
 
  <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script> 
  <script src="https://cdn.jsdelivr.net/npm/vuetify@2.0.0-alpha.10/dist/vuetify.min.js"></script>