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	/home/rails/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.8/lib/phusion_passenger/rack/application_spawner.rb	134	in `rescue in start'
1	/home/rails/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.8/lib/phusion_passenger/rack/application_spawner.rb	129	in `start'
2	/home/rails/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.8/lib/phusion_passenger/spawn_manager.rb	253	in `block (2 levels) in spawn_rack_application'
3	/home/rails/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.8/lib/phusion_passenger/abstract_server_collection.rb	132	in `lookup_or_add'
4	/home/rails/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.8/lib/phusion_passenger/spawn_manager.rb	246	in `block in spawn_rack_application'
5	/home/rails/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.8/lib/phusion_passenger/abstract_server_collection.rb	82	in `block in synchronize'
6		prelude>	10:in `synchronize'
7	/home/rails/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.8/lib/phusion_passenger/abstract_server_collection.rb	79	in `synchronize'
8	/home/rails/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.8/lib/phusion_passenger/spawn_manager.rb	244	in `spawn_rack_application'
9	/home/rails/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.8/lib/phusion_passenger/spawn_manager.rb	137	in `spawn_application'
10	/home/rails/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.8/lib/phusion_passenger/spawn_manager.rb	275	in `handle_spawn_application'
11	/home/rails/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.8/lib/phusion_passenger/abstract_server.rb	357	in `server_main_loop'
12	/home/rails/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.8/lib/phusion_passenger/abstract_server.rb	206	in `start_synchronously'
13	/home/rails/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.8/helper-scripts/passenger-spawn-server	99	in `'