What to do when components don't render properly?

UI Framework Component Library Not Installed Correctly
Make sure the UI component library you are using is installed and configured correctly. Taking Element Plus as an example, make sure Element Plus is installed and configured according to the documentation.
js
// main.js or main.ts
import { createApp } from 'vue';
import ElementPlus from 'element-plus';
import 'element-plus/dist/index.css';
import App from './App.vue';
const app = createApp(App);
app.use(ElementPlus);
app.mount('#app');

