each(&block) problem - Ruby examples - please help [SOLVED]

class Speech
    def initialize
        print "What is the speech name?"
        @title = gets.chomp
        @lines = []
        while add_line
            puts "Line added."
        end
    end

    def title
        @title
    end

    def add_line
        puts "Add a line: (blank line to exit)"
        line = gets.chomp
        if line.length > 0
            @lines.push line
            return line
        else
            return nil
        end
    end

    def each(%block)
        @lines.each { |line| yield line }
    end

end

speech = Speech.new
speech.each do |line|
    puts "[#{speech.title}] #{line}"
end