"Random" compilation errors when importing modules

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Hi all,

I’m taking the Elixir/OTP course over at Developing With Elixir/OTP (Pragmatic Studio). When I run my file with elixir <path-to-file> all is well. However, I defined a module and ran iex -S mix and after that, the compiler throws errors saying the module cannot be imported. I rolled the code back and the error persists. I deleted the _build directory with no success. The module is defined in plugins.ex as follows:

defmodule Servy.Plugins do
  import Logger

  def rewrite_path(%{path: "/wildlife"} = conv) do
      %{ conv | path: "/wildthings" }
  end

  def rewrite_path(%{path: path} = conv) do
      regex = ~r{\/(?<thing>\w+)\?id=(?<id>\d+)}
      captures = Regex.named_captures(regex, path)
      rewrite_path_captures(conv, captures)
  end

  def rewrite_path(conv), do: conv

  def rewrite_path_captures(conv, %{"thing" => thing, "id" => id}) do
      %{ conv | path: "/#{thing}/#{id}" }
  end

  def rewrite_path_captures(conv, nil), do: conv

  def log(conv) do
      Logger.info "Inspecting conversation map..."
      IO.inspect conv
  end

  def track(%{status: 404, path: path} = conv) do
      IO.puts "Warning: #{path} is on the loose!"
      conv
  end

  def track(conv), do: conv
end

and it is imported in handler.ex as follows:

defmodule Servy.Handler do
	@moduledoc "Handles HTTP requests."

  @pages_path Path.expand("../../pages", __DIR__)

  import Servy.Plugins, only: [rewrite_path: 1, log: 1, track: 1]
...

Any ideas what’s going on?

TIA.