# File lib/compass/commands/project_base.rb, line 75
      def assert_project_directory_exists!
        if File.exists?(project_directory) && !File.directory?(project_directory)
          raise Compass::FilesystemConflict.new("#{project_directory} is not a directory.")
        elsif !File.directory?(project_directory)
          raise Compass::Error.new("#{project_directory} does not exist.")
        end
      end