Rails - Jun 2014 - I am doing codeschool Ruby Bits Part2, but get stucked.

In this lesson, I am learning optional block.
class Library
  attr_accessor :games

  def initialize(games)
    @games = games
  end

  def list
    games.each do |game|
      if block_given?
      puts yield game
    else
      puts game.name

    end
  end
end

When I summit code, it shows syntax error, unexpected end_of_file.  :(
I can't solve this problem, please help!!!!!!

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