# File lib_ctrl/rucy/params.rb, line 298
    def messengers=(new_messengers)
      if (new_messengers == 0) then
        raise "not allowed zero number of messengers: #{new_messengers.inspect}"
      end
      if (new_messengers < 0) then
        raise "not allowed negative number of messengers: #{new_messengers.inspect}"
      end
      @params['messengers'] = new_messengers
    end