changing_configuration!

# File activesupport/lib/active_support/messages/rotation_coordinator.rb, line 51
        def changing_configuration!
          if @codecs.any?
            raise <<~MESSAGE
              Cannot change #{self.class} configuration after it has already been applied.

              The configuration has been applied with the following salts:
              #{@codecs.keys.map { |salt| "- #{salt.inspect}" }.join("\n")}
            MESSAGE
          end
        end