in TopBar I try to import Login by async way (import()) but there is nothing on screen

export default {
  name: "TopBar",
  components:{
    'Login':() => import('./TopBar/Login')  <--here
  },
  setup(){
    const isShow = ref(false)
    return {
      isShow
    }
  }
}

In component Login I try to print some information and a problem has arisen. [Vue warn]: Invalid VNode type: undefined (undefined)