Support for the Ruby 2.4 series has ended. See here for reference.
# File rss/maker/atom.rb, line 129 def to_feed(feed, current) generator = current.class::Generator.new if setup_values(generator) current.generator = generator set_parent(generator, current) setup_other_elements(feed) elsif variable_is_set? raise NotSetError.new(self.class.not_set_name, not_set_required_variables) end end