title: Symfony2 + SonataAdmin - assets not loading
body: <p>I have Symfony 2.8 installed with Sonata Admin Bundle:</p>
  
  <pre><code>"sonata-project/admin-bundle": "2.4.*@dev",
  "sonata-project/doctrine-orm-admin-bundle": "^2.3"
  </code></pre>
  
  <p>The Sonata admin is successfully installed and accessible at <a href="http://xxxxx.com/admin" rel="nofollow noreferrer">http://xxxxx.com/admin</a>, but It can't load JS and CSS files (I get error 404). The files live in web/bundles folder:</p>
  
  <pre><code>drwxr--r-- 2 rabotnici rabotnici 4096 Dec 13 01:44 ./
  drwxr-x--- 4 rabotnici nobody    4096 Dec 13 01:13 ../
  lrwxrwxrwx 1 rabotnici rabotnici   91 Dec 13 01:44 framework -&gt; /home1/rabotnici/vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Resources/public/
  lrwxrwxrwx 1 rabotnici rabotnici   68 Dec 13 01:44 sonataadmin -&gt; /home1/rabotnici/vendor/sonata-project/admin-bundle/Resources/public/
  lrwxrwxrwx 1 rabotnici rabotnici   67 Dec 13 01:44 sonatacore -&gt; /home1/rabotnici/vendor/sonata-project/core-bundle/Resources/public/
  </code></pre>
  
  <p>Is there anything more to be configured?</p>
  
  <p>When I try to open the CSS from the browser and I get error 404, here is the result of the prod.log:</p>
  
  <pre><code>No route found for "GET /bundles/sonatacore/vendor/ionicons/css/ionicons.min.css
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/0qXZF.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0qXZF.jpg" alt="Error404 loading assets of Sonata Admin"></a></p>