Yesterday I got my new DS220+ and now I am trying to install phpbb on it. I have installed Web Station, PHP 7.4, Apache 2.4, MariaDB and copied the phpbb data into the web folder. Unfortunately I cannot start app.php installer. I get a message that the page has an error 500. The index.html is working. Does anyone know how I could get the installer to work? Do I need to install anything else or change any settings?