Ruby on Rails application could not be started

These are the possible causes:
  • There may be a syntax error in the application's code. Please check for such errors and fix them.
  • A required library may not installed. Please install all libraries that this application requires.
  • The application may not be properly configured. Please check whether all configuration files are written correctly, fix any incorrect configurations, and restart this application.
  • A service that the application relies on (such as the database server or the Ferret search engine server) may not have been started. Please start that service.
Further information about the error may have been written to the application's log file. Please check it in order to analyse the problem.
Error message:
No such file or directory - /nonexistent
Exception class:
Errno::ENOENT
Application root:
/u/apps/mephisto
Backtrace:
# File Line Location
0 /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb 723 in `initialize'
1 /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb 723 in `new'
2 /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb 723 in `set_paths'
3 /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb 719 in `each'
4 /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb 719 in `set_paths'
5 /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb 526 in `path'
6 /usr/local/lib/ruby/site_ruby/1.8/rubygems/source_index.rb 66 in `installed_spec_directories'
7 /usr/local/lib/ruby/site_ruby/1.8/rubygems/source_index.rb 56 in `from_installed_gems'
8 /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb 736 in `source_index'
9 /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb 140 in `activate'
10 /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb 49 in `gem'
11 ./config/boot.rb 59 in `load_rails_gem'
12 ./config/boot.rb 53 in `load_initializer'
13 ./config/boot.rb 38 in `run'
14 ./config/boot.rb 11 in `boot!'
15 ./config/boot.rb 109
16 /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb 31 in `gem_original_require'
17 /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb 31 in `require'
18 ./config/environment.rb 12
19 /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb 31 in `gem_original_require'
20 /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb 31 in `require'
21 /usr/local/src/passenger/lib/passenger/railz/application_spawner.rb 263 in `preload_application'
22 /usr/local/src/passenger/lib/passenger/railz/application_spawner.rb 223 in `initialize_server'
23 /usr/local/src/passenger/lib/passenger/utils.rb 216 in `report_app_init_status'
24 /usr/local/src/passenger/lib/passenger/railz/application_spawner.rb 211 in `initialize_server'
25 /usr/local/src/passenger/lib/passenger/abstract_server.rb 181 in `start_synchronously'
26 /usr/local/src/passenger/lib/passenger/abstract_server.rb 150 in `start'
27 /usr/local/src/passenger/lib/passenger/railz/application_spawner.rb 187 in `start'
28 /usr/local/src/passenger/lib/passenger/spawn_manager.rb 270 in `spawn_rails_application'
29 /usr/local/src/passenger/lib/passenger/abstract_server_collection.rb 118 in `lookup_or_add'
30 /usr/local/src/passenger/lib/passenger/spawn_manager.rb 264 in `spawn_rails_application'
31 /usr/local/src/passenger/lib/passenger/abstract_server_collection.rb 74 in `synchronize'
32 /usr/local/src/passenger/lib/passenger/abstract_server_collection.rb 73 in `synchronize'
33 /usr/local/src/passenger/lib/passenger/spawn_manager.rb 263 in `spawn_rails_application'
34 /usr/local/src/passenger/lib/passenger/spawn_manager.rb 158 in `spawn_application'
35 /usr/local/src/passenger/lib/passenger/spawn_manager.rb 300 in `handle_spawn_application'
36 /usr/local/src/passenger/lib/passenger/abstract_server.rb 333 in `__send__'
37 /usr/local/src/passenger/lib/passenger/abstract_server.rb 333 in `main_loop'
38 /usr/local/src/passenger/lib/passenger/abstract_server.rb 183 in `start_synchronously'
39 /usr/local/src/passenger/bin/passenger-spawn-server 46