Following chapter (1) of the Ruby on Rails tutorial:
http://railstutorial.org/, I was able to successfuly push the
application to "Heroku" using:
git push heroku master
But, when I open the website, I get a page with the following:
This application is temporarily offline.
If you're the administrator of this app, please check your heroku logs
for the backtrace.
Why is that? And, why don't I see the default Rails page?