asset_file_path!

# File actionpack/lib/action_view/helpers/asset_tag_helper.rb, line 902
        def asset_file_path!(path)
          unless is_uri?(path)
            absolute_path = asset_file_path(path)
            raise(Errno::ENOENT, "Asset file not found at '#{absolute_path}'" ) unless File.exist?(absolute_path)
            return absolute_path
          end
        end