使用Glide进行图像处理不起作用

I am using Glide image library without framework.I follow the tutorial http://glide.thephpleague.com/1.0/installation/

My question is most likely How to use image manipulation library Glide with plain PHP but it is not my question and that solution not work for me.

when I point url localhost/myproject/routes.php nothing displayed. when I print the $server variable it is printed.

<?php
require 'vendor/autoload.php';
use League\Flysystem\Adapter\Local;
use League\Flysystem\Filesystem;
use League\Glide\ServerFactory;


// Setup Glide server
$server = League\Glide\ServerFactory::create([
    'source' => 'img/users/source',
    'cache' => 'img/users/cache',
]);

echo '<pre>';
print_r($server);
echo '</pre>';



echo $server->outputImage('users/1.jpg', ['w' => 300, 'h' => 400]);