Unknown registry: MyApp.Pubsub

[7stud]

If you are getting the error:

(ArgumentError) unknown registry: AuctionWeb.PubSub

while trying to follow “Phoenix in Action 1.4”, then you are in luck! Go here:

Phoenix in Action book: Running the code in 2023

Geoffrey Lessel’s 2019 book, Phoenix in Action, was written for Phoenix 1.4. I found that the book’s code examples did not match the current Phoenix 1.7 web application structure. Reverting to Phoenix 1.6, I was able to build, run, and test the example Auction Web application. As I worked through the book, I made the following changes to accomodate Phoenix 1.6: 6.1 Installing Phoenix on your system Install the latest version of Phoenix 1.6. mix archive.install hex phx_new 1.6.16 6.2 Creati…