Ver se tem u erro

App.js

import React, { Component } from 'react';
import {BrowserRouter, Switch, Route} from 'react-router-dom';

import Login from './pages/Login';
import Timeline from './pages/Timeline';

class App extends Component {
  render() {
    return (
      <BrowserRouter>
          <Switch>
            <Route path = "/" exact Component = {Login} />
            <Route path = "/timeline" Component = {Timeline} />
          </Switch>
      </BrowserRouter>
    );
  }
}

export default App;