I changed everything to "LATEST" and this is what I get (and localhost:8000 brings up a blank page)

[kevin@belay address-book]$ boot -u >boot.properties
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See  for further details.
Retrieving maven-metadata.xml from  (3k)
[kevin@belay address-book]$ boot dev
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See  for further details.
Classpath conflict: org.clojure/clojure version 1.8.0 already loaded, NOT loading version 1.10.2-alpha2
Starting reload server on 

Starting file watcher (CTRL-C to quit)...

Writing HTML files...
? index.html
Writing adzerk/boot_reload/index.cljs to connect to ...
Adding :require adzerk.boot-reload.index to index.html.cljs.edn...
Compiling ClojureScript...
? index.html.js
WARNING: Use of undeclared Var hoplon.app-pages._index_DOT_html/html at line 3 hoplon/app_pages/_index_DOT_html.cljs
WARNING: Use of undeclared Var hoplon.app-pages._index_DOT_html/head at line 4 hoplon/app_pages/_index_DOT_html.cljs
WARNING: Use of undeclared Var hoplon.app-pages._index_DOT_html/link at line 5 hoplon/app_pages/_index_DOT_html.cljs
WARNING: Use of undeclared Var hoplon.app-pages._index_DOT_html/body at line 6 hoplon/app_pages/_index_DOT_html.cljs
WARNING: Use of undeclared Var hoplon.app-pages._index_DOT_html/h1 at line 7 hoplon/app_pages/_index_DOT_html.cljs
Starting Jetty on port 8000...
2020-10-25 16:16:37.964:INFO::clojure-agent-send-off-pool-0: Logging initialized @90722ms
2020-10-25 16:16:38.088:INFO:oejs.Server:clojure-agent-send-off-pool-0: jetty-9.3.1.v20150714
2020-10-25 16:16:38.495:INFO:oejw.StandardDescriptorProcessor:clojure-agent-send-off-pool-0: NO JSP Support for /, did not find org.eclipse.jetty.jsp.JettyJspServlet
2020-10-25 16:16:38.524:INFO:oejsh.ContextHandler:clojure-agent-send-off-pool-0: Started o.e.j.w.WebAppContext@70b18f{/,file:///home/kevin/.boot/cache/tmp/home/kevin/0work/temp/address-book/3o0/5fkqd8/,AVAILABLE}
2020-10-25 16:16:38.550:INFO:oejs.ServerConnector:clojure-agent-send-off-pool-0: Started ServerConnector@8459b7{HTTP/1.1,[http/1.1]}{0.0.0.0:8000}
2020-10-25 16:16:38.551:INFO:oejs.Server:clojure-agent-send-off-pool-0: Started @91309ms
Elapsed time: 44.753 sec