小编lth*_*eed的帖子

我有一个路由器插头

defmodule Rest do
  use Plug.Router
  import Plug.Conn

  plug :match
  plug :dispatch

  get "/hello" do
    send_resp(conn, 200, "Hello, world!")
  end

  match _ do
    send_resp(conn, 404, "oops")
  end

  def start do
    Plug.Adapters.Cowboy.http Rest, [], port: 80
  end

  def stop do
    Plug.Adapters.Cowboy.shutdown Rest.HTTP
  end
end

但是,当我调用Rest.start时

{:error,
 {{:shutdown,
   {:failed_to_start_child, :ranch_acceptors_sup,
    {{:badmatch, {:error, :eacces}},
     [{:ranch_acceptors_sup, :init, 1,
       [file: 'src/ranch_acceptors_sup.erl', line: 30]},
      {:supervisor, :init, 1, [file: 'supervisor.erl', line: 243]},
      {:gen_server, :init_it, 6, [file: 'gen_server.erl', line: 306]},
      {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 239]}]}}},
  {:child, …