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:
syntax error on line 68, col 0: `production:'
Exception class:
ArgumentError
Application root:
/usr/share/redmine-0.9.4
Backtrace:
# File Line Location
0 /usr/lib/ruby/1.8/yaml.rb 133 in `load'
1 /usr/lib/ruby/1.8/yaml.rb 133 in `load'
2 /usr/lib/ruby/1.8/yaml.rb 144 in `load_file'
3 /usr/lib/ruby/1.8/yaml.rb 143 in `open'
4 /usr/lib/ruby/1.8/yaml.rb 143 in `load_file'
5 /usr/share/redmine-0.9.4/config/initializers/40-email.rb 6
6 /usr/share/redmine-0.9.4/vendor/rails/activesupport/lib/active_support/dependencies.rb 147 in `load_without_new_constant_marking'
7 /usr/share/redmine-0.9.4/vendor/rails/activesupport/lib/active_support/dependencies.rb 147 in `load'
8 /usr/share/redmine-0.9.4/vendor/rails/railties/lib/initializer.rb 622 in `load_application_initializers'
9 /usr/share/redmine-0.9.4/vendor/rails/railties/lib/initializer.rb 621 in `each'
10 /usr/share/redmine-0.9.4/vendor/rails/railties/lib/initializer.rb 621 in `load_application_initializers'
11 /usr/share/redmine-0.9.4/vendor/rails/railties/lib/initializer.rb 176 in `process'
12 /usr/share/redmine-0.9.4/vendor/rails/railties/lib/initializer.rb 113 in `send'
13 /usr/share/redmine-0.9.4/vendor/rails/railties/lib/initializer.rb 113 in `run'
14 /usr/share/redmine-0.9.4/config/environment.rb 20
15 /usr/lib/ruby/1.8/rubygems/custom_require.rb 31 in `gem_original_require'
16 /usr/lib/ruby/1.8/rubygems/custom_require.rb 31 in `require'
17 /var/lib/gems/1.8/gems/passenger-2.2.11/lib/phusion_passenger/railz/application_spawner.rb 303 in `preload_application'
18 /var/lib/gems/1.8/gems/passenger-2.2.11/lib/phusion_passenger/railz/application_spawner.rb 252 in `initialize_server'
19 /var/lib/gems/1.8/gems/passenger-2.2.11/lib/phusion_passenger/utils.rb 255 in `report_app_init_status'
20 /var/lib/gems/1.8/gems/passenger-2.2.11/lib/phusion_passenger/railz/application_spawner.rb 237 in `initialize_server'
21 /var/lib/gems/1.8/gems/passenger-2.2.11/lib/phusion_passenger/abstract_server.rb 194 in `start_synchronously'
22 /var/lib/gems/1.8/gems/passenger-2.2.11/lib/phusion_passenger/abstract_server.rb 163 in `start'
23 /var/lib/gems/1.8/gems/passenger-2.2.11/lib/phusion_passenger/railz/application_spawner.rb 213 in `start'
24 /var/lib/gems/1.8/gems/passenger-2.2.11/lib/phusion_passenger/spawn_manager.rb 262 in `spawn_rails_application'
25 /var/lib/gems/1.8/gems/passenger-2.2.11/lib/phusion_passenger/abstract_server_collection.rb 126 in `lookup_or_add'
26 /var/lib/gems/1.8/gems/passenger-2.2.11/lib/phusion_passenger/spawn_manager.rb 256 in `spawn_rails_application'
27 /var/lib/gems/1.8/gems/passenger-2.2.11/lib/phusion_passenger/abstract_server_collection.rb 80 in `synchronize'
28 /var/lib/gems/1.8/gems/passenger-2.2.11/lib/phusion_passenger/abstract_server_collection.rb 79 in `synchronize'
29 /var/lib/gems/1.8/gems/passenger-2.2.11/lib/phusion_passenger/spawn_manager.rb 255 in `spawn_rails_application'
30 /var/lib/gems/1.8/gems/passenger-2.2.11/lib/phusion_passenger/spawn_manager.rb 154 in `spawn_application'
31 /var/lib/gems/1.8/gems/passenger-2.2.11/lib/phusion_passenger/spawn_manager.rb 287 in `handle_spawn_application'
32 /var/lib/gems/1.8/gems/passenger-2.2.11/lib/phusion_passenger/abstract_server.rb 352 in `__send__'
33 /var/lib/gems/1.8/gems/passenger-2.2.11/lib/phusion_passenger/abstract_server.rb 352 in `main_loop'
34 /var/lib/gems/1.8/gems/passenger-2.2.11/lib/phusion_passenger/abstract_server.rb 196 in `start_synchronously'
35 /var/lib/gems/1.8/gems/passenger-2.2.11/bin/passenger-spawn-server 61