Internal server error

Passenger encountered the following error:

The application spawner server exited unexpectedly: No space left on device

Exception class:
PhusionPassenger::Railz::ApplicationSpawner::Error
Backtrace:
# File Line Location
0 /usr/lib/ruby/gems/1.8/gems/passenger-2.2.5/lib/phusion_passenger/railz/application_spawner.rb 218 in `start'
1 /usr/lib/ruby/gems/1.8/gems/passenger-2.2.5/lib/phusion_passenger/spawn_manager.rb 262 in `spawn_rails_application'
2 /usr/lib/ruby/gems/1.8/gems/passenger-2.2.5/lib/phusion_passenger/abstract_server_collection.rb 126 in `lookup_or_add'
3 /usr/lib/ruby/gems/1.8/gems/passenger-2.2.5/lib/phusion_passenger/spawn_manager.rb 256 in `spawn_rails_application'
4 /usr/lib/ruby/gems/1.8/gems/passenger-2.2.5/lib/phusion_passenger/abstract_server_collection.rb 80 in `synchronize'
5 /usr/lib/ruby/gems/1.8/gems/passenger-2.2.5/lib/phusion_passenger/abstract_server_collection.rb 79 in `synchronize'
6 /usr/lib/ruby/gems/1.8/gems/passenger-2.2.5/lib/phusion_passenger/spawn_manager.rb 255 in `spawn_rails_application'
7 /usr/lib/ruby/gems/1.8/gems/passenger-2.2.5/lib/phusion_passenger/spawn_manager.rb 154 in `spawn_application'
8 /usr/lib/ruby/gems/1.8/gems/passenger-2.2.5/lib/phusion_passenger/spawn_manager.rb 287 in `handle_spawn_application'
9 /usr/lib/ruby/gems/1.8/gems/passenger-2.2.5/lib/phusion_passenger/abstract_server.rb 352 in `__send__'
10 /usr/lib/ruby/gems/1.8/gems/passenger-2.2.5/lib/phusion_passenger/abstract_server.rb 352 in `main_loop'
11 /usr/lib/ruby/gems/1.8/gems/passenger-2.2.5/lib/phusion_passenger/abstract_server.rb 196 in `start_synchronously'
12 /usr/lib/ruby/gems/1.8/gems/passenger-2.2.5/bin/passenger-spawn-server 61