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-----> Detecting rake tasks
!
! Could not detect rake tasks
! ensure you can run `$ bundle exec rake -P` against your app
! and using the production group of your Gemfile.
:
! rake aborted!
! LoadError: cannot load such file -- thwait
:
! Push rejected, failed to compile Ruby app.
! Push failed

だめだったー。帰ったらbundle installしてみよう。