O código a seguir está me mostrando o erro da seguinte maneira:

"ruby -KU -- 'C:\Users\Ishmael\My Documents\Aptana Studio 3 Workspace\Simple\FirstFile'
C:/Users/Ishmael/My Documents/Aptana Studio 3 Workspace/Simple/FirstFile:55: syntax error, unexpected $end, expecting keyword_end"

Eu procurei o (s) fim (es) extra (s) e o (s) rastro (s), mas em vão e ainda não consigo entender por que ele não está funcionando!

class Greeter
  attr_accessor :name

  def initialize(name="dudes")
    @name=name
  end

  def say_hi

    if @name.nil?
      puts "..."
    else if @name.respond_to?("each")

      @name.each do |name|
        puts "Hello #{name.capitalize}!"
      end

    else
      puts "Hi #{@name.capitalize}!"
    end

  end 

  def say_bye

    if @name.nil?
      puts "..."
    else if @name.respond_to?("join")
      puts 'Goodbye #{@name.join(", ").capitalize}! Come back soon!'
    else
      puts "Bye #{@name.capitalize}!"
    end

  end

end

if __FILE__ == $0

  greeter = Greeter.new
  greeter.say_hi
  greeter.say_bye

  greeter.name = "Ishmael"
  greeter.say_hi
  greeter.say_bye

  greeter.name = ["Albert", "Brenda", "Charles", "Dave", "Englebert"]
  greeter.say_hi
  greeter.say_bye

  greeter.name = nil
  greeter.say_hi
  greeter.say_bye
end