# File lib/compass/commands/update_project.rb, line 81
      def check_for_sass_files!(compiler)
        file_list = compiler.file_list
        if file_list.empty?
          message = "Compass can't find any Sass files to compile.\nIs your compass configuration correct?.\nIf 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
        elsif missing = file_list.find {|(sass_file, _, _)| !File.exist?(sass_file)}
          raise Compass::Error, "File not found: #{missing[0]}"
        end
      end