Routing Symfony 2 404 profiler debug toolbar

In a fresh installation of Symfony 3, the debug toolbar not showing, when I have the apache 2.4.7 configuration file:

<VirtualHost *:80>
    ServerAdmin [email protected]
    ServerName dev.enterprise.cl
    #ServerAlias www.domain.tld
    DocumentRoot /var/www/html/gestion/web
    DirectoryIndex app_dev.php

    # uncomment the following lines if you install assets as symlinks
    # or run into problems when compiling LESS/Sass/CoffeScript assets
    # <Directory /var/www/html/gestion>
    #     Options FollowSymlinks
    # </Directory>

    ErrorLog /var/log/apache2/project_error.log
    CustomLog /var/log/apache2/project_access.log combined
</VirtualHost>

If I change the configuration file to:

<VirtualHost *:80>
    ServerAdmin [email protected]
    ServerName dev.enterprise.cl
    # ServerAlias www.domain.tld
    DocumentRoot /var/www/html/gestion/web
    # DirectoryIndex app_dev.php

    # uncomment the following lines if you install assets as symlinks
    # or run into problems when compiling LESS/Sass/CoffeScript assets
    # <Directory /var/www/html/gestion>
    #     Options FollowSymlinks
    # </Directory>

    ErrorLog /var/log/apache2/project_error.log
    CustomLog /var/log/apache2/project_access.log combined
</VirtualHost>

And access: http://dev.enterprise.cl/app_dev.php, all going ok.

What is wrong?