Logs full with (ArgumentError) unknown registry: RumblWeb.PubSub

[APB9785]

I found another thread where the same issue is discussed from #14 down. It seems the module naming conventions in the book are a little outdated now - but it’s easily fixable!

Pubsub in a phoenix app under umbrella

I would like to add this here for future reference: I ran into this problem while going thru Programming Phoenix 1.4 book, Chapter 11, section Extracting Rumbl and RumblWeb, page 238 very bottom. The error encountered is this (adding to be google-able): ** (Mix) Could not start application rumbl_web: RumblWeb.Application.start(:normal, []) returned an error: shutdown: failed to start child: RumblWeb.Presence ** (EXIT) shutdown: failed to start child: Phoenix.Presence.Tracker ** (E…