# File lib/less/command.rb, line 92
    def err s = '', type = ''
      type = type.strip + ' ' unless type.empty?
      $stderr.print "#{o("! #{type}Error", :red)}: #{s}"
      if @options[:growl]
        growl = Growl.new
        growl.title = "LESS"
        growl.message = "#{type}Error in #@source!"
        growl.run
        false
      end
    end