Problems with CodeIgniter 4.0.4

in your command prompt, navigate into the root folder and enter the following command

php spark serve

If you want to avoid the index.php, create a .htaccess file and put the following code there:

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L]

Hope this helps