Hi,

This error is probably due to the fact that the webserver is not correctly configured. In GLPI 11.0, your document root have to be the public directory and all requests have to be redirected to the public/index.php. See https://glpi-install.readthedocs.io/en/latest/prerequisites.html#web-server for web server configuration examples.

Exactly it's working now thanks @cedric-anne

We will probably have to put back a file to be included in all our front legacy scripts to check whether the webserver is correctly configured. Waiting for #18141 to be merged to have less files to update.

If we want to prevent this kind of errors to be displayed when the web server is misconfigured, once #19483 is merged, we could include a file, in all of our front file, that displays the dedicated error page:

require_once(__DIR__ . '/_check_webserver_config.php');

// /front/_check_webserver_config.php

if (!class_exists('Glpi\\Kernel\\Kernel', autoload: false)) {
    // `Glpi\Kernel\Kernel` class will exists if the request was processed by the `/public/index.php` file,
    // and will not be found otherwise.
    http_response_code(404);
    readfile(__DIR__ . '/../index.html');
    exit();
}

This solution is pretty simple, and will probably have 0 impact on performances. It will not handle plugin files, but I guess plugins files are not the most common entrypoint used when GLPI has just been deployed on a webserver.

@AdrienClairembault, @trasher, is this solution is OK for you?

Looks good to me, yes.