vue2升级为vue3 vuedraggable 拖动组件报错

1、Error: draggable element must have an item slot

升级组件

npm i -S vuedraggable@next

使用示例

   <div class="col-3">
      <h3>Draggable 1</h3>
      <draggable
        class="list-group"
        :list="list1"
        group="people"
        @change="log"
        itemKey="name"
      >
        <template #item="{ element, index }">
          <div>{{ element.name }} {{ index }}</div>
        </template>
      </draggable>
    </div>

    <div class="col-3">
      <h3>Draggable 2</h3>
      <draggable
        class="list-group"
        :list="list2"
        group="people"
        @change="log"
        itemKey="name"
      >
        <template #item="{ element, index }">
          <div class="list-group-item">{{ element.name }} {{ index }}</div>
        </template>
      </draggable>
    </div>

const list1 = ref([
  { name: "John", id: 1 },
  { name: "Joao", id: 2 },
  { name: "Jean", id: 3 },
  { name: "Gerard", id: 4 }
])
const list2 = ref([
  { name: "Juan", id: 5 },
  { name: "Edgard", id: 6 },
  { name: "Johnson", id: 7 }
])

2、Item slot must have only one child

官方GitHub - SortableJS/vue.draggable.next: Vue 3 compatible drag-and-drop component based on Sortable.js

官方demo

https://sortablejs.github.io/vue.draggable.next/#/two-lists