Corrected manifest.yml file for Rails CloudFoundry deployment, error output

error.txt

-----> Preparing app for Rails asset pipeline
       Running: rake assets:precompile
       Asset precompilation completed (1.74s)
       Cleaning assets
       Running: rake assets:clean
-----> Uploading droplet (24M)

0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 2 starting, 1 down
0 of 3 instances running, 3 down
0 of 3 instances running, 3 down
0 of 3 instances running, 3 down
0 of 3 instances running, 3 down
0 of 3 instances running, 3 down
0 of 3 instances running, 1 starting, 2 down
0 of 3 instances running, 1 starting, 2 down
0 of 3 instances running, 1 starting, 2 down
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 2 starting, 1 down
0 of 3 instances running, 2 starting, 1 down
0 of 3 instances running, 2 starting, 1 down
0 of 3 instances running, 2 starting, 1 down
0 of 3 instances running, 2 starting, 1 down
0 of 3 instances running, 1 starting, 2 down
0 of 3 instances running, 1 starting, 2 down
0 of 3 instances running, 1 starting, 2 down
0 of 3 instances running, 1 starting, 2 down
0 of 3 instances running, 1 starting, 2 down
0 of 3 instances running, 1 starting, 2 down
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 3 starting
0 of 3 instances running, 2 starting, 1 down
0 of 3 instances running, 2 starting, 1 down
0 of 3 instances running, 2 starting, 1 down
0 of 3 instances running, 2 starting, 1 failing
FAILED
Start unsuccessful

manifest.yml

---
applications:
- name: pivot-pong
  command: bundle exec rake cf:on_first_instance db:migrate && bundle exec rails s -p $PORT -e $RAILS_ENV
  buildpack: git://github.com/heroku/heroku-buildpack-ruby.git