Won't start ("No permission to fork process")

I cloned this repo, installed the deps. When running swipl -s main.pl -- --port=8080, I get this:

Running in development mode!
% 2019-06-09 17:38:31.150 type post preview URL /post/<slug> registered
No permission to fork process `main' (running_threads([<thread>(3,0x559515090e50),<thread>(4,0x559515133650),<thread>(5,0x5595151d92d0)]))

Using SWI-Prolog version 8.0.2 for x86_64-linux.

(Your own blog looks really nice, and was surprised to see that it was built in SWI Prolog. I'm curious about trying it out!)

[rla]

Hey @hjek, you need to run with --interactive=true option, otherwise it tries to fork and daemonize the process. It uses http://www.swi-prolog.org/pldoc/man?section=httpunixdaemon.
I will update the README.