Can't find app.js

[mb8z]

I have tried to use your boilerplate and see how it works, but as I start my server a message like this appear:
ActionView::Template::Error (Can't find app.js in /Users/NYC/Desktop/JavaScript/RailsReact/webpacker-react-frontend/public/packs/manifest.json. Is webpack still compiling?):

I haven't changed anything yet, just wanted to give it a shot.

[gauravtiwari]

@Ancinek Did you run ./bin/webpack-dev-server alongside bundle exec rails s?

[mb8z]

@guaravTiwari I ran foreman start -f Procfile.dev. I see the same error while running those commands that you wrote as well.

Edit
I run Rails 5.1.2 and ruby 2.3.1 - does this make any difference?