我有一个可以在本地完美运行的Ruby Sinatra应用程序。我已将其转移到生产机器，并得到以下（无用的）错误。有人能指出我正确的方向吗？
Passenger encountered the following error:
The application spawner server exited unexpectedly: Unexpected end-of-file detected.
Exception class:
PhusionPassenger::Rack::ApplicationSpawner::Error
Backtrace:
# File Line Location
0 /usr/local/rvm/gems/ruby-1.9.2-p320/gems/passenger-3.0.13/lib/phusion_passenger/rack/application_spawner.rb 135 in `rescue in start'
1 /usr/local/rvm/gems/ruby-1.9.2-p320/gems/passenger-3.0.13/lib/phusion_passenger/rack/application_spawner.rb 130 in `start'
2 /usr/local/rvm/gems/ruby-1.9.2-p320/gems/passenger-3.0.13/lib/phusion_passenger/spawn_manager.rb 253 in `block (2 levels) in spawn_rack_application'
3 /usr/local/rvm/gems/ruby-1.9.2-p320/gems/passenger-3.0.13/lib/phusion_passenger/abstract_server_collection.rb 132 in `lookup_or_add'
4 /usr/local/rvm/gems/ruby-1.9.2-p320/gems/passenger-3.0.13/lib/phusion_passenger/spawn_manager.rb 246 in `block in spawn_rack_application'
5 /usr/local/rvm/gems/ruby-1.9.2-p320/gems/passenger-3.0.13/lib/phusion_passenger/abstract_server_collection.rb 82 in `block in synchronize'
6 prelude> 10:in `synchronize'
7 /usr/local/rvm/gems/ruby-1.9.2-p320/gems/passenger-3.0.13/lib/phusion_passenger/abstract_server_collection.rb 79 in `synchronize'
8 /usr/local/rvm/gems/ruby-1.9.2-p320/gems/passenger-3.0.13/lib/phusion_passenger/spawn_manager.rb 244 in `spawn_rack_application'
9 /usr/local/rvm/gems/ruby-1.9.2-p320/gems/passenger-3.0.13/lib/phusion_passenger/spawn_manager.rb 137 in `spawn_application'
10 /usr/local/rvm/gems/ruby-1.9.2-p320/gems/passenger-3.0.13/lib/phusion_passenger/spawn_manager.rb 275 in `handle_spawn_application'
11 /usr/local/rvm/gems/ruby-1.9.2-p320/gems/passenger-3.0.13/lib/phusion_passenger/abstract_server.rb 357 in `server_main_loop'
12 /usr/local/rvm/gems/ruby-1.9.2-p320/gems/passenger-3.0.13/lib/phusion_passenger/abstract_server.rb 206 in `start_synchronously'
13 /usr/local/rvm/gems/ruby-1.9.2-p320/gems/passenger-3.0.13/helper-scripts/passenger-spawn-server 99 in `'
我已经在Stack Overflow上看到类似的问题，但他们似乎没有回答我遇到的问题。
这是在带有Apache和Passenger mod的Ubuntu服务器（10.04）上。
非常感谢