I\'m a RoR-Beginner and I started learning it with the RoR-Tutorial.
Actually I\'m at this chapter (http://ruby.railstutorial.org/chapters/static-pages#top) and try to install
Seems like you've created your project with a later version (rails 3.1) of rails gem. Make sure you're using a gemset which only has rails 3.0.9 gems and then do rails new to create your project. This will make sure that the sprockets/railtie line would not occur in your application.rb