php - 500 error after deployment to remote server

Question

I've finished my project with Symfony2, and I would like to deploy it on my server.

So, I've uploaded the files to the www/ folder of my ovh server and configured the parameters.yml.

I don't have ssh access, only ftp.

When I go to mywebsite.fr/web/config.php, it works. But when I go to mywebsite.fr/web/app.php I got an error 500 whereas I've no problem in local.

Then, I tried several .htaccess files without results.

This is an example of .htaccess I found:

<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^(.*)$ web/$1 [QSA,L]
</IfModule>

SetEnv SHORT_OPEN_TAGS 0
SetEnv REGISTER_GLOBALS 0
SetEnv MAGIC_QUOTES 0
SetEnv SESSION_AUTOSTART 0
SetEnv ZEND_OPTIMIZER 1
SetEnv PHP_VER 5_4

Thank you.