Ruby Final Project[Show Error]

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I am having an error in my program with the show method. On the bottom of page 7/13 of the Ruby final project, they include the solution code to the program. I checked, double checked and triple checked. I am running identical code unless somehow I missed something.
My menu is currently only

'1' Adds a new task
'2' Displays the list
'Q' quits the app

Adding a task to the program seems to run fine. But when I Display the list I get an error that looks something like

#<Task:0x00000000028857f0>

…great.
So I added a “.to_s” to “puts my_list.show” because I am trying to make something happen with my limited knowledge.

case user_input
      when '1'
        my_list.add(Task.new(prompt("What Task would you like to add?")))
      when '2'
        puts my_list.show.to_s
      else
        puts "Say again?"
    end

Now I run the program, add a task go to show the list and!?

[#<Task:0x00000000028857f0 @description="Shibby Dibby Doo">]

Okay, we are getting somewhere…maybe.
Now it’s in array brackets, and showing the instance variable @description. Then the actual Task I added “Shibby Dibby Doo”.

I’ve been stuck here for quite a bit now. Please if you can lend a hand, I’d very much appreciate it!

Here is all the code I’ve written so far.

module Menu

  def menu
    "Please choose from the following...
    '1' Adds a new Task
    '2' Displays the List
    'Q' Quits the app"
  end

  def show
    menu
  end
end

module Promptable
  def prompt(message = "What would you like to do?", symbol = ":> ")
    print message
    print symbol
    gets.chomp
  end
end

class List
  attr_reader :all_tasks

  def initialize
    @all_tasks = []
  end

  def add(task)
    all_tasks << task
  end

  def show
    all_tasks
  end
end

class Task
  attr_reader :description

  def initialize(description)
    @description = description
  end
end

if __FILE__ == $PROGRAM_NAME
  include Menu
  include Promptable
  my_list = List.new
  puts "Welcome to Vaughn's TO DO List Program!"
  until ['q'].include?(user_input = prompt(show).downcase)
    case user_input
      when '1'
        my_list.add(Task.new(prompt("What Task would you like to add?")))
      when '2'
        puts my_list.show.to_s
      else
        puts "Say again?"
    end
  end
  puts "Thanks for using Vaughn's TO DO List!"
end