Ruby on Rails application could not be started

A source file that the application requires, is missing.
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Error message:
Could not find RubyGem radiant (= 0.6.4)
Exception class:
Gem::LoadError
Application root:
/home/eastnewb/rails_apps/eastnewbritain/releases/20080303111011
Backtrace:
# File Line Location
0 /usr/lib/ruby/1.8/rubygems.rb 379 in `report_activate_error'
1 /usr/lib/ruby/1.8/rubygems.rb 311 in `activate'
2 /usr/lib/ruby/1.8/rubygems.rb 65 in `active_gem_with_options'
3 /usr/lib/ruby/1.8/rubygems.rb 50 in `gem'
4 ./config/boot.rb 31
5 /usr/lib/ruby/1.8/rubygems/custom_require.rb 27 in `gem_original_require'
6 /usr/lib/ruby/1.8/rubygems/custom_require.rb 27 in `require'
7 ./config/environment.rb 10
8 /usr/lib/ruby/1.8/rubygems/custom_require.rb 27 in `gem_original_require'
9 /usr/lib/ruby/1.8/rubygems/custom_require.rb 27 in `require'
10 /var/lib/gems/1.8/gems/passenger-1.0.1/lib/passenger/application_spawner.rb 234 in `preload_application'
11 /var/lib/gems/1.8/gems/passenger-1.0.1/lib/passenger/application_spawner.rb 183 in `initialize_server'
12 /var/lib/gems/1.8/gems/passenger-1.0.1/lib/passenger/abstract_server.rb 145 in `start_synchronously'
13 /var/lib/gems/1.8/gems/passenger-1.0.1/lib/passenger/abstract_server.rb 114 in `start'
14 /var/lib/gems/1.8/gems/passenger-1.0.1/lib/passenger/abstract_server.rb 108 in `fork'
15 /var/lib/gems/1.8/gems/passenger-1.0.1/lib/passenger/abstract_server.rb 108 in `start'
16 /var/lib/gems/1.8/gems/passenger-1.0.1/lib/passenger/application_spawner.rb 147 in `start'
17 /var/lib/gems/1.8/gems/passenger-1.0.1/lib/passenger/spawn_manager.rb 106 in `spawn_application'
18 /var/lib/gems/1.8/gems/passenger-1.0.1/lib/passenger/spawn_manager.rb 102 in `synchronize'
19 /var/lib/gems/1.8/gems/passenger-1.0.1/lib/passenger/spawn_manager.rb 102 in `spawn_application'
20 /var/lib/gems/1.8/gems/passenger-1.0.1/lib/passenger/spawn_manager.rb 178 in `handle_spawn_application'
21 /var/lib/gems/1.8/gems/passenger-1.0.1/lib/passenger/abstract_server.rb 291 in `__send__'
22 /var/lib/gems/1.8/gems/passenger-1.0.1/lib/passenger/abstract_server.rb 291 in `main_loop'
23 /var/lib/gems/1.8/gems/passenger-1.0.1/lib/passenger/abstract_server.rb 147 in `start_synchronously'
24 /var/lib/gems/1.8/gems/passenger-1.0.1/bin/passenger-spawn-server 32