<p dir="auto">I'm using symfony 2.6.1 and try to call :  "/_error/404.html" as described at <a href="http://symfony.com/blog/new-in-symfony-2-6-error-page-previews" rel="nofollow">http://symfony.com/blog/new-in-symfony-2-6-error-page-previews</a> and got this :<br>
<a target="_blank" rel="noopener noreferrer nofollow" href="https://cloud.githubusercontent.com/assets/459648/5421025/15ae8eaa-8290-11e4-8bc3-bb3a949d71f6.png"><img src="https://cloud.githubusercontent.com/assets/459648/5421025/15ae8eaa-8290-11e4-8bc3-bb3a949d71f6.png" alt="fatal-404-error-previews" style="max-width: 100%;"></a></p>
<p dir="auto">I'm using symfony 2.6.1 and try to call :  "/_error/404.html" as described at <a href="http://symfony.com/blog/new-in-symfony-2-6-error-page-previews" rel="nofollow">http://symfony.com/blog/new-in-symfony-2-6-error-page-previews</a> and got this :<br>
<a target="_blank" rel="noopener noreferrer nofollow" href="https://cloud.githubusercontent.com/assets/459648/5421025/15ae8eaa-8290-11e4-8bc3-bb3a949d71f6.png"><img src="https://cloud.githubusercontent.com/assets/459648/5421025/15ae8eaa-8290-11e4-8bc3-bb3a949d71f6.png" alt="fatal-404-error-previews" style="max-width: 100%;"></a></p>