An internal error occurred while trying to spawn the application. Exception type: Passenger::SystemException Error message: Cannot create a Unix socket pair: Too many open files (errno=24) Backtrace: in 'void Passenger::ApplicationPool2::SmartSpawner::startPreloader()' (SmartSpawner.h:205) in 'virtual Passenger::ApplicationPool2::SpawnObject Passenger::ApplicationPool2::SmartSpawner::spawn(const Passenger::ApplicationPool2::Options&)' (SmartSpawner.h:750) in 'void Passenger::ApplicationPool2::Group::spawnThreadRealMain(const Passenger::ApplicationPool2::SpawnerPtr&, const Passenger::ApplicationPool2::Options&, unsigned int)' (Implementation.cpp:1038)