*** Passenger ERROR (ext/common/ApplicationPool/../SpawnManager.h:220):
Could not start the spawn server: /usr/bin/ruby: No such file or directory (2)
[ pid=19910 thr=140359890249696 file=ext/apache2/Hooks.cpp:862 time=2012-06-29 08:26:59.544 ]: Unexpected error in mod_passenger: Cannot spawn application '/data/var/www/rails/redmine': Could not read from the spawn server: Connection reset by peer (104)
  Backtrace:
     in 'virtual Passenger::SessionPtr Passenger::ApplicationPool::Client::get(const Passenger::PoolOptions&)' (Client.h:742)
     in 'Passenger::SessionPtr Hooks::getSession(const Passenger::PoolOptions&)' (Hooks.cpp:294)
     in 'int Hooks::handleRequest(request_rec*)' (Hooks.cpp:563)