need help to add to my website multisite

Hello, I'm new to the community, the great work of the members.
I need help getting my site to multisite.
Once I edit the wp-config.php file and insert the line define ('WP_ALLOW_MULTISITE', true), and reraise the file to the server again, I turn to tools and network setup but there do not tell me nothing, I get the for the installation menu and choose if I want to subdomain or subdirectories. could someone tell me where the installation is failing? thanks
added screenshot