Web Development with Clojure, Third Edition: Issue adding Shadow CLJS

Title: Web Development with Clojure, Third Edition, pg 116

Hi - I just started chapter 5 and I am stuck on page 116 while trying to start up shadow CLJS. Here is the error

shadow-cljs - nREPL server started on port 7002
shadow-cljs - watching build :app
[:app] Configuring build.
[:app] Compiling ...
[:app] Build failure:
The required namespace "guestbook.core" is not available, it was required by "guestbook/app.cljs".
"guestbook/core.clj" was found on the classpath. Should this be a .cljs file?

Here is my project.clj dev profile

:project/dev  {:jvm-opts ["-Dconf=dev-config.edn" ]
                  :dependencies [[pjstadig/humane-test-output "0.10.0"]
                                 [prone "2020-01-17"]
                                 [ring/ring-devel "1.8.1"]
                                 [ring/ring-mock "0.4.0"]
                                 [thheller/shadow-cljs "2.11.4"]
                                 [binaryage/devtools "0.9.10"]]
                  :plugins      [[com.jakemccrary/lein-test-refresh "0.24.1"]
                                 [jonase/eastwood "0.3.5"]] 
                  :source-paths ["env/dev/clj" "env/dev/cljc" "env/dev/cljs"]
                  :resource-paths ["env/dev/resources"]
                  :repl-options {:init-ns user
                                 :timeout 120000}
                  :injections [(require 'pjstadig.humane-test-output)
                               (pjstadig.humane-test-output/activate!)]}

Here is my setup:

Screen Shot 2020-09-20 at 12.21.17 PM2796×1560 331 KB

Any ideas here? Loving the book by the way, an enjoyable first dive into Clojure web development.