Internal server error

An internal error occurred while trying to spawn the application.
Exception type: Passenger::SystemException
Error message: Cannot create a temporary directory in the format of '/tmp/passenger-spawn-debug.XXX': No space left on device (errno=28)
Backtrace:
     in 'void Passenger::ApplicationPool2::SmartSpawner::startPreloader()' (SmartSpawner.h:203)
     in 'virtual Passenger::ApplicationPool2::ProcessPtr Passenger::ApplicationPool2::SmartSpawner::spawn(const Passenger::ApplicationPool2::Options&)' (SmartSpawner.h:746)
     in 'void Passenger::ApplicationPool2::Group::spawnThreadRealMain(const SpawnerPtr&, const Passenger::ApplicationPool2::Options&, unsigned int)' (Implementation.cpp:977)
Error ID
Application root
/home/bai2/rails_root
Environment (value of RAILS_ENV, RACK_ENV, WSGI_ENV, NODE_ENV and PASSENGER_APP_ENV)
production
Ruby interpreter command
/usr/local/rbenv/versions/2.2.2/bin/ruby
User and groups
Unknown
Environment variables
Unknown
Ulimits
Unknown