class Sprockets::Railtie::ManifestNeededError

def initialize
  msg = "Expected to find a manifest file in `app/assets/config/manifest.js`\n" +
  "But did not, please create this file and use it to link any assets that need\n" +
  "to be rendered by your app:\n\n" +
  "Example:\n" +
  "  //= link_tree ../images\n"  +
  "  //= link_directory ../javascripts .js\n" +
  "  //= link_directory ../stylesheets .css\n"  +
  "and restart your server"
  super msg
end