InvoicePlane setup returns with "Not found"

Hey all,
I am trying to install InvoicePlane on Ubuntu, all requirements seem to be met but still when I visit invoice.heroroos.nl (my desired subdomain for InvoicePlane) I get an error 404 “not found”.
When I go to invoice.heroroos.nl/index.php/setup I get redirected to invoice.heroroos.nl/setup/language, so it does seem to do something.
Does anyone have any idea why this may be happening?
Thanks!