post-list.html - test 화면표시

안녕하세요 강사님.

vuetify 3 사용중이며, 테이블이 표시가 안돼서 문의 남깁니다.

<template>
  <v-data-table :headers="headers" :items="posts" :sort-by="name" class="elevation-1" items-per-page="5">
    <template v-slot:top>
      <v-toolbar flat>
        <v-toolbar-title>Post List</v-toolbar-title>
        <v-divider class="mx-4" inset vertical></v-divider>
        <v-spacer></v-spacer>
        <v-dialog v-model="dialog" max-width="500px">
          <template v-slot:activator="{ props }">
            <v-btn color="primary" dark class="mb-2" v-bind="props">
              New Post
            </v-btn>
          </template>
          <v-card>
            <v-card-title>
              <span class="text-h5">{{ formTitle }}</span>
            </v-card-title>

            <v-card-text>
              <v-container>
                <v-row>
                  <v-col cols="12" sm="6" md="4">
                    <v-text-field v-model="editedItem.name" label="Dessert name"></v-text-field>
                  </v-col>
                  <v-col cols="12" sm="6" md="4">
                    <v-text-field v-model="editedItem.calories" label="Calories"></v-text-field>
                  </v-col>
                  <v-col cols="12" sm="6" md="4">
                    <v-text-field v-model="editedItem.fat" label="Fat (g)"></v-text-field>
                  </v-col>
                  <v-col cols="12" sm="6" md="4">
                    <v-text-field v-model="editedItem.carbs" label="Carbs (g)"></v-text-field>
                  </v-col>
                  <v-col cols="12" sm="6" md="4">
                    <v-text-field v-model="editedItem.protein" label="Protein (g)"></v-text-field>
                  </v-col>
                </v-row>
              </v-container>
            </v-card-text>

            <v-card-actions>
              <v-spacer></v-spacer>
              <v-btn color="blue-darken-1" variant="text" @click="close">
                Cancel
              </v-btn>
              <v-btn color="blue-darken-1" variant="text" @click="save">
                Save
              </v-btn>
            </v-card-actions>
          </v-card>
        </v-dialog>
        <v-dialog v-model="dialogDelete" max-width="500px">
          <v-card>
            <v-card-title class="text-h5">Are you sure you want to delete this item?</v-card-title>
            <v-card-actions>
              <v-spacer></v-spacer>
              <v-btn color="blue-darken-1" variant="text" @click="closeDelete">Cancel</v-btn>
              <v-btn color="blue-darken-1" variant="text" @click="deleteItemConfirm">OK</v-btn>
              <v-spacer></v-spacer>
            </v-card-actions>
          </v-card>
        </v-dialog>
      </v-toolbar>
    </template>
    <template v-slot:[`item.actions`]="{ item }">
      <v-icon size="small" class="me-2" @click="editItem(item.raw)">
        mdi-pencil
      </v-icon>
      <v-icon size="small" @click="deleteItem(item.raw)"> mdi-delete </v-icon>
    </template>
    <template v-slot:no-data>
      <v-btn color="primary" @click="initialize"> Reset </v-btn>
    </template>
  </v-data-table>
</template>

<script>
export default {
  data: () => ({
    dialog: false,
    dialogDelete: false,
    headers: [
      {
        title: 'ID',
        align: 'start',
        sortable: false,
        key: 'name',
      },
      { title: '제 목', key: 'calories' },
      { title: '요 약', key: 'fat' },
      { title: '수정일', key: 'carbs' },
      { title: '작성자', key: 'protein' },
      { title: 'Actions', key: 'actions', sortable: false },
    ],
    posts: [],
    editedIndex: -1,
    editedItem: {
      name: '',
      calories: 0,
      fat: 0,
      carbs: 0,
      protein: 0,
    },
    defaultItem: {
      name: '',
      calories: 0,
      fat: 0,
      carbs: 0,
      protein: 0,
    },
  }),

  computed: {
    formTitle() {
      return this.editedIndex === -1 ? 'New Item' : 'Edit Item'
    },
  },

  watch: {
    dialog(val) {
      val || this.close()
    },
    dialogDelete(val) {
      val || this.closeDelete()
    },
  },

  created() {
    this.initialize()
  },

  methods: {
    initialize() {
      this.posts = [
        {
          name: 1,
          calories: 'Django 3.0 Released',
          fat: '2019년 12월 장고 3.0 버전 팔표함.',
          carbs: '2020-07-13',
          protein: 'shkim',
        },
        {
          name: 'Ice cream sandwich',
          calories: 237,
          fat: 9.0,
          carbs: 37,
          protein: 4.3,
        },
        {
          name: 'Eclair',
          calories: 262,
          fat: 16.0,
          carbs: 23,
          protein: 6.0,
        },
      ]
    },

    editItem(item) {
      this.editedIndex = this.desserts.indexOf(item)
      this.editedItem = Object.assign({}, item)
      this.dialog = true
    },

    deleteItem(item) {
      this.editedIndex = this.desserts.indexOf(item)
      this.editedItem = Object.assign({}, item)
      this.dialogDelete = true
    },

    deleteItemConfirm() {
      this.desserts.splice(this.editedIndex, 1)
      this.closeDelete()
    },

    close() {
      this.dialog = false
      this.$nextTick(() => {
        this.editedItem = Object.assign({}, this.defaultItem)
        this.editedIndex = -1
      })
    },

    closeDelete() {
      this.dialogDelete = false
      this.$nextTick(() => {
        this.editedItem = Object.assign({}, this.defaultItem)
        this.editedIndex = -1
      })
    },

    save() {
      if (this.editedIndex > -1) {
        Object.assign(this.posts[this.editedIndex], this.editedItem)
      } else {
        this.posts.push(this.editedItem)
      }
      this.close()
    },
  },
}
</script>

최근에 올려주신 코드를 복붙해봤는데도 잘 안됩니다 ㅜㅜ