impory component vue in your App.vue file code example
Example 1: vue import component
<template>
<Btn />
</template>
<script>
import Btn from './components/Btn'
export default {
components: { Btn },
}
</script>
Example 2: registeing components in vue
import Sidebar from '../../components/sidebar/main.vue';
export default {
props: [""],
components: {
'sidebar': Sidebar
},
...