Ruby on Rails

i'm following along with michael hartl's tutorial
(http://ruby.railstutorial.org/chapters/a-demo-app#top), creating a demo
app.

i pushed my app/db/data on to heroku (falling-sky-4350.heroku.com/), but
am getting an error

An error occurred in the application and your page could not be served.
Please try again in a few moments.

If you are the application owner, check your logs for details.


my heroku log is attached. can someone please help me to suss it out?
thanks.

Attachments:
http://www.ruby-forum.com/attachment/6643/heroku.error


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