If you have this problem, like I had few moments ago deploying this web last version, the solution is simple.
You have already activated rake 10.0.2, but your Gemfile requires rake 0.9.2.2. Using bundle exec may solve this.
block in setup'
The solution is pretty simple:
$ gem uninstall rake
And deploy again. Works like a charm. Don’t worry,
your rake won’t go anywhere . The thing is, you had installed it twice .