What's wrong with this htaccess file

What's wrong with this htaccess file

I'm trying to use this .htaccess file in an mvc project to redirect
everything to the index page/controller/method/params but when I go to the
root directory I get a 500 error. Is there something wrong with the code:
php_flag display_errors on
php_value error_reporting 9999
RewriteEngine On
RewriteBase /mvc/
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-l
RewriteRule ^(.+)$ index.php?url=$1 [QSA,L]