AmauryPi Is your webserver correctly configured? The webserver should serve the public directory, an then you access your forum at http://localhost/—the /public part is internal.
datitisev datlechinvn There's two things wrong here. The exception should have been handled by the exception handlers, and not be uncaught Your URL should not include /public, see the Installation docs on how to set up URL rewriting if you haven't already
AmauryPi datlechinvn Okay that the same error you mentioned on your first post, but what about your web server configuration? How is your webserver configured?
datitisev datlechinvn What hasn't been edited yet? The config.php? That file is created after you install Flarum.