Laravel + Vue JS Routing shows page not found

I followed this tutorial https://laraveldaily.com/quick-start-laravel-5-5-vue-js-simple-crud-project/

However when I load : localhost/admin/companies , I get page not found .

I tried to change to this too

const router = new VueRouter({
 routes: [
   { path: '/admin/companies', component: CompaniesController }
 ]
})

But I get "Syntax error { " on the part VueRouter({ which I don't understand why. Can anyone help?

Thanks!

via Chebli Mohamed