[FLOW3-general] New package throws 404

[Mathis Hoffmann]

Hello,

I just installed FLOW3 on my Plesk-powered webserver (Ubunutu).
Everything works fine and I get the welcome screen. But when I run for
example ./flow3 kickstart:package Acme.Demo and enter
myflow3domain.de/Acme.Demo I get the FLOW3-404 ("The technical reason
is: No controller could be resolved which would match your request.")
What can I do?

Thanks in advance for your help!
Mathis Hoffmann