Silex error

gistfile1.php

<?php
require_once 'silex.phar';

$app = new Silex\Application();

$app->get('/', function () {
    return 'index';
});

$app->get('/hello/{name}', function ($name) { 
    return "Hello $name";
}) 
->assert('name', '^.*') 
->convert('name', function ($name, $request) { 
    return $request->get('name') ?: "bar";
});

$app->get('/hello2/{name}', function ($name) {
    $name = !empty($name)? $name: "bar"; 
    return "Hello $name";
}) 
->assert('name', '^.*') ;

$app->run();

gistfile2.txt

$ curl http://localhost/silex.php/hello/

Fatal error: Uncaught exception 'Symfony\Component\Routing\Matcher\Exception\NotFoundException' in phar:///tmp/silex.phar/src/Silex/Application.php on line 167
Symfony\Component\Routing\Matcher\Exception\NotFoundException: in phar:///tmp/silex.phar/vendor/Symfony/Component/Routing/Matcher/UrlMatcher.php on line 33