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    Hi, Kulga !

    Kulga Website URL if available, screenshots of the error

    URL : forum.devcube.fr
    Screenshot : http://image.noelshack.com/fichiers/2016/44/1477991774-nouvelle-image-4.png

    Kulga Ensure debug is set to true in config.php

    I switched "debug" to true, but the error still the same.

    Kulga What webserver software are you using - does it match the requirements?

    I use Apache with PHP 5.6.26-0+deb8u1and MySQL 5.5.52-0+deb8u1 - (Debian).

    Kulga What php version and extensions do you have? (in command line - php -m; php -v)

    Here :

    Kulga Are you using a VPS or Shared Hosting?

    I use my own VPS.

    Kulga Relevant server error logs

    Nohting in my error log ?

    Kulga From root of your Flarum install, run this command in the command line php flarum info

    Kulga What have you tried so far?

    I checked "url" in my config.php.

                        Hello Kulga

                        Kulga I presume you checked in /var/log/apache2/error.log After triggering the error?

                        Sure.

                        Kulga Since you're using apache, you might need to enable url rewriting
                        This may help: http://xmodulo.com/how-to-enable-mod_rewrite-in-apache2-on-debian-ubuntu.html
                        There is also a thread here on enabling it: solving_404_not_found_issues_on_apache

                        Thank you for this links. mod_rewrite is enabled (I use wordpress on the main domain devcube.fr and it needs it).
                        However, I forgot a thing : in the .htaccess file, I removed Header unset Proxy because it generate a 500 error...

                                plagoutte I'm not sure, but based on your post, this recent post may be helpful.

                                Getting the error from that 500 error may be useful though.