title: Exception PhusionPassenger::UnknownError in PhusionPassenger::Rack::ApplicationSpawner
body: <p>I'm using sinatra for my app, i replicated the exact copy from devserver1 to devserver2, but only on devserver1 is working.</p>
  
  <p>I got this on my devserver2 apache error.log :</p>
  
  <blockquote>
    <p>Exception PhusionPassenger::UnknownError in PhusionPassenger::Rack::ApplicationSpawner (undefined method `&lt;&lt;' for nil:NilClass (NoMethodError)) (process 5516, thread #):</p>
  </blockquote>
  
  <p>Any help is much appreciated.</p>
  
  <p>FYI: I'm using rvm and ruby-1.9.2</p>