My components `vue` files are in `src/components/` while my `index.js` router file (whose content is down below) is in `src/router/`. 

Why do I get *"Error: Can't resolve './components/App.vue'"* error?

```
import Vue from 'vue';
import App from './components/App.vue';
import SignUp from './components/SignUp.vue';
import Login from './components/Login.vue';

import Router from 'vue-router';
Vue.use(Router);

export default new Router({
  routes: [
  {
    path: '/',
    name: 'Home',
    component: App
  },
  {
    path: '/login',
    name: 'Login',
    component: Login
  },
  {
    path: 'signup',
    name: 'SignUp',
    component: SignUp
  },
  ]
});

```