Basic Spree 2.0.3 app deployment to Heroku not working

Basic Spree 2.0.3 app deployment to Heroku not working

I'm just getting started, thanks for the help! I'm just trying to get the
most basic app up and running and I'm getting the famous "sorry something
went wrong"
I'm following this guide:
http://guides.spreecommerce.com/developer/heroku.html.
I generate a new vanilla app and successfully deploy it to Heroku. I do
the required changed to use postgres. "heroku open" shows me the expected
rails splash screen. Then:
spree install --auto-accept
I follow the guide, add the ruby version, make the minor changes spree.rb
and application.rb
Then
> git add .
> git commit am "added spree"
> git push heroku master
> heroku run rake db: migrate
localhost:3000 shows me a happy spree app, missing the pictures because
they are supposed to be on s3, but, heroku is broke. My "heroku logs" has
pages that look like this:
2013-08-06T23:30:04.173821+00:00 app[web.1]:
vendor/bundle/ruby/1.9.1/gems/act
ionpack-3.2.13/lib/abstract_controller/base.rb:167:in `process_action'
2013-08-06T23:30:04.173985+00:00 app[web.1]:
vendor/bundle/ruby/1.9.1/gems/act
ivesupport-3.2.13/lib/active_support/notifications.rb:123:in `block in
instrumen
t'
2013-08-06T23:30:04.174527+00:00 app[web.1]:
vendor/bundle/ruby/1.9.1/gems/jou
rney-1.0.4/lib/journey/router.rb:56:in `each'
2013-08-06T23:30:04.174857+00:00 app[web.1]:
vendor/bundle/ruby/1.9.1/gems/rac
k-1.4.5/lib/rack/conditionalget.rb:25:in `call'
2013-08-06T23:30:04.175424+00:00 app[web.1]:
vendor/bundle/ruby/1.9.1/gems/act
ionpack-3.2.13/lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
2013-08-06T23:30:04.175577+00:00 app[web.1]:
vendor/bundle/ruby/1.9.1/gems/rac
k-cache-1.2/lib/rack/cache/context.rb:185:in `lookup' Now, when I run the
heroku migration, I get the deprecation warnings that I have "Rails
2.3-style plugins in vendor/plugins!" but from what I've read that's not
what is breaking it.
Any advice? Thanks!