I posted about this a few weeks ago but never got around to making a ticket or anything: https://www.phpbb.com/community/viewtopic.php?p=16009966

In the extension documentation, specifically the page that mentions controllers, there's a code example which contains an error. The code has a use declaration followed by the file namespace which in php8 throws a fatal error.

 <?php

use \Symfony\Component\HttpFoundation\Response;

namespace acme\demo\controller;

class main

The namespace should come first, then the use declaration.

It should instead be as follows:

 <?php

namespace acme\demo\controller;

use \Symfony\Component\HttpFoundation\Response;

class main