title: random error symfony:ContextErrorException: Warning: simplexml_load_file(): I/O warning : failed to load external entity
body: <p>In my project with Symfony, I have this random error appear when I go to random page in my application:</p>
  
  <pre><code>ContextErrorException: Warning: simplexml_load_file(): I/O warning : failed to load external entity "C:\wamp\www\Symfony\vendor\friendsofsymfony\user-bundle\Resources\config\doctrine\model/User.orm.xml" 
  </code></pre>
  
  <p>in C:\wamp\www\Symfony\vendor\doctrine\orm\lib\Doctrine\ORM\Mapping\Driver\XmlDriver.php line 736</p>
  
  <p>Refresh the page many times seems to disable this error until it appears again.</p>
  
  <p>I think, Symfony try to <strong>load</strong> <code>.xml</code> format but FOSUserBundle is in <code>.yml</code>.</p>
  
  <p>I use <strong>Symfony 2.5.6</strong>, and the <strong>5.5.12 php version</strong> with <strong>WAMP Server</strong>.</p>
  
  <p>For now, this error is not disturbing my application developpement, but I would like to find the solution anyway. I don't understand why I have this error now.</p>
  
  <p>The only things change in my application is that I insert some datas in my database with <strong>SQL request</strong> (in fact I use some data which already exist in another database, I have to import them in my new database with SQL on <strong>PhpMyAdmin</strong>, but nothing came wrong with SQL when I inserted them). The import worked well and there's no mistake with the datas of my database project.</p>