我一直在尝试本地部署我的rails 4应用程序，我收到这个奇怪的错误消息。 有谁知道这意味着什么？
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