问错误“未知的自定义元素...”仅适用于特定的Vuetify组件，如v-expansion-panels

EN

import Vue from 'vue'
import './plugins/vuetify.js'
import App from './App.vue'

new Vue({
   router,
  store,
  render: h => h(App)
}).$mount('#app')

import Vue from 'vue'
import 'vuetify/src/stylus/app.styl'

Vue.use(Vuetify, {
  iconfont: ' md || fa', 

  theme: {
    primary: '#F5A623',
    secondary: '#a9a9a9',
    accent: '#82B1FF',
    error: '#FF5252',
    info: '#2196F3',
    success: '#4CAF50',
    warning: '#FFC107',
  }
})

<template>
    <div>
        <v-expansion-panels>
            <v-expansion-panel v-for="(item,i) in 5" :key="i">
                <v-expansion-panel-header>Item</v-expansion-panel-header>
                <v-expansion-panel-content>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</v-expansion-panel-content>
            </v-expansion-panel>
        </v-expansion-panels>
    </div>
</template>

<script>
export default {};

import Vuetify, { VExpansionPanel } from 'vuetify/lib'
Vue.use(Vuetify, {
  components: {
    VExpansionPanel
  },