Hugo site not loading to local server

I changed the theme from kube to learn in ATOM. When I click packages>hugofy>start server I get an error message instead.
The error says: error running server.
I’m not a developer but I write the help section. How do I fix this?
Is it because I need to configure the new theme more?

Does the error also happen if you type hugo server -D followed by Enter in Atom’s terminal? (So without using the hugofy 3rd party plugin.)