Streammaster - struggling to make it work

Hi all.

Anyone managed to install, and run Streammaster on a Truenas Scale?

Xteve is the original, Streammaster is a fork that is being worked on.
It is re-streaming IPTV, and can be connected to Plex or similar at the server.
I am able to install it, but struggling to make the web-portal work.
I try to set up folders, ports etc. according to the spec. on the Github page, but something is wrong.
I get the “ERR_CONNECTION_REFUSED” message in my web browser.
Anyone know the software, and made it to work?

Brgds.
Geir