# File lib/compass/commands/update_project.rb, line 13
      def perform
        compiler = new_compiler_instance
        if compiler.sass_files.empty?
          message = "Nothing to compile. If you're trying to start a new project, you have left off the directory argument.\n"
          message << "Run \"compass -h\" to get help."
          raise Compass::Error, message
        else
          compiler.run
        end
      end