url' attribute is not specified and no embedded datasource could be configu

import { createRouter, createWebHistory } from 'vue-router';
import Home from './components/Home.vue';
import About from './components/About.vue';

const routes = [
  { path: '/', component: Home },
  { path: '/about', component: About }
];

const router = createRouter({
  history: createWebHistory(),
  routes
});

export default router;

<template>
  <div>
    <h1>Data List</h1>
    <ul>
      <li v-for="item in items" :key="item.id">{{ item.name }}</li>
    </ul>
  </div>
</template>

<script>
import { ref, onMounted } from 'vue';

export default {
  setup() {
    const items = ref([]);

    onMounted(async () => {
      try {
        const response = await fetch('https://api.example.com/data');
        const data = await response.json();
        items.value = data;
      } catch (error) {
        console.error('Error fetching data:', error);
      }
    });

    return {
      items
    };
  }
};
</script>