Deploy Rails 4 + Passenger + nginx: weird bug

I am trying to deploy a rails 4 application locally and I am getting this strange error message. Does anyone know what this means?

An error occurred while starting up the preloader. It exited before signalling successful startup back to Phusion Passenger. Please read this article for more information about this problem.
Raw process output:

SpawnPreparerShell: /Users/wn2870/.rvm/gems/ruby-2.0.0-p353@global/gems/passenger-4.0.37/buildout/agents/SpawnPreparer: No such file or directory
SpawnPreparerShell: line 0: exec: /Users/wn2870/.rvm/gems/ruby-2.0.0-p353@global/gems/passenger-4.0.37/buildout/agents/SpawnPreparer: cannot execute: No such file or directory
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