I am trying the various Getting started examples and I can get a basic hello world example working with basic HTML in the route as such

(ns hello-world
  (:use compojure.core ring.adapter.jetty)
  (:require [compojure.route :as route]))

(defroutes example
  (GET "/" [] "<h1>Hello World Wide Web!</h1>"))

(run-jetty example {:port 8080})

But when I attempt to use the html helpers like so

(ns hello-world
  (:use compojure ring.adapter.jetty)
  (:require [compojure.route :as route]))

(defroutes example
  (GET "/"
    (html [:h1 "Hello World"])))

(run-jetty example {:port 8080})

Then I get the following error

[null] Exception in thread "main" java.io.FileNotFoundException: Could not locate compojure__init.class or compojure.clj on classpath: (core.clj:1)