Phoenix错误：模块Phoenix.Auth未加载且无法找到

Question

我在处理我自己的项目时正在阅读凤凰书，我收到了这个错误：

== Compilation error in file web/router.ex ==
** (CompileError) web/router.ex:2: module Phoenix.Auth is not loaded and 
could not be found
expanding macro: ComicApp.Web.__using__/1
web/router.ex:2: ComicApp.Router (module)
(elixir) expanding macro: Kernel.use/2
web/router.ex:2: ComicApp.Router (module)
(elixir) lib/kernel/parallel_compiler.ex:198: anonymous fn/4 in 
Kernel.ParallelCompiler.spawn_workers/6

转到这些页面的代码如下：

defmodule ComicApp.Router do
use ComicApp.Web, :router

pipeline :browser do
 plug :accepts, ["html"]
 plug :fetch_session
 plug :fetch_flash
 plug :protect_from_forgery
 plug :put_secure_browser_headers
 plug ComicApp.Auth, repo: ComicApp.Repo
end

pipeline :api do
 plug :accepts, ["json"]
end

scope "/", ComicApp do
 pipe_through :browser # Use the default browser stack
 get "/", PageController, :index
 resources "/users", UserController, only: [:index, :show, :new, 
:create]
  resources "/sessions", SessionController, only: [:new, :create, 
:delete]

end

scope "/manage", ComicApp do
  pipe_through [:browser, :authenticate_user]
  resources "/comics", ComicController
 end
end

这是我的GitHub文件：https://github.com/cggarcia171/ComicBookLibrary