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:
uninitialized constant ActionView::Helpers::JavaScriptElementProxy::ActionView
Exception class:
NameError
Application root:
/srv/www/webyast
Backtrace:
# File Line Location
0 /usr/lib/ruby/gems/1.9.1/gems/activesupport-2.3.14/lib/active_support/dependencies.rb 131 in `rescue in const_missing'
1 /usr/lib/ruby/gems/1.9.1/gems/activesupport-2.3.14/lib/active_support/dependencies.rb 120 in `const_missing'
2 /srv/www/webyast/vendor/plugins/jrails/lib/jrails.rb 230 in `'
3 /srv/www/webyast/vendor/plugins/jrails/lib/jrails.rb 227 in `'
4 /srv/www/webyast/vendor/plugins/jrails/lib/jrails.rb 3 in `'
5 /srv/www/webyast/vendor/plugins/jrails/lib/jrails.rb 2 in `'
6 /usr/lib/ruby/1.9.1/rubygems/custom_require.rb 36 in `require'
7 /usr/lib/ruby/1.9.1/rubygems/custom_require.rb 36 in `require'
8 /usr/lib/ruby/gems/1.9.1/gems/activesupport-2.3.14/lib/active_support/dependencies.rb 184 in `require'
9 /srv/www/webyast/vendor/plugins/jrails/init.rb 7 in `block in evaluate_init_rb'
10 /usr/lib/ruby/gems/1.9.1/gems/rails-2.3.14/lib/rails/plugin.rb 158 in `eval'
11 /usr/lib/ruby/gems/1.9.1/gems/rails-2.3.14/lib/rails/plugin.rb 158 in `block in evaluate_init_rb'
12 /usr/lib/ruby/gems/1.9.1/gems/activesupport-2.3.14/lib/active_support/core_ext/kernel/reporting.rb 11 in `silence_warnings'
13 /usr/lib/ruby/gems/1.9.1/gems/rails-2.3.14/lib/rails/plugin.rb 154 in `evaluate_init_rb'
14 /usr/lib/ruby/gems/1.9.1/gems/rails-2.3.14/lib/rails/plugin.rb 48 in `load'
15 /usr/lib/ruby/gems/1.9.1/gems/rails-2.3.14/lib/rails/plugin/loader.rb 38 in `block in load_plugins'
16 /usr/lib/ruby/gems/1.9.1/gems/rails-2.3.14/lib/rails/plugin/loader.rb 37 in `each'
17 /usr/lib/ruby/gems/1.9.1/gems/rails-2.3.14/lib/rails/plugin/loader.rb 37 in `load_plugins'
18 /usr/lib/ruby/gems/1.9.1/gems/rails-2.3.14/lib/initializer.rb 369 in `load_plugins'
19 /usr/lib/ruby/gems/1.9.1/gems/rails-2.3.14/lib/initializer.rb 165 in `process'
20 /usr/lib/ruby/gems/1.9.1/gems/rails-2.3.14/lib/initializer.rb 113 in `run'
21 /srv/www/webyast/config/environment.rb 44 in `'
22 /usr/lib/ruby/1.9.1/rubygems/custom_require.rb 36 in `require'
23 /usr/lib/ruby/1.9.1/rubygems/custom_require.rb 36 in `require'
24 /usr/lib/ruby/gems/1.9.1/gems/passenger-3.0.12/lib/phusion_passenger/classic_rails/application_spawner.rb 94 in `block (2 levels) in spawn_application'
25 /usr/lib/ruby/gems/1.9.1/gems/passenger-3.0.12/lib/phusion_passenger/utils.rb 572 in `report_app_init_status'
26 /usr/lib/ruby/gems/1.9.1/gems/passenger-3.0.12/lib/phusion_passenger/classic_rails/application_spawner.rb 92 in `block in spawn_application'
27 /usr/lib/ruby/gems/1.9.1/gems/passenger-3.0.12/lib/phusion_passenger/utils.rb 479 in `safe_fork'
28 /usr/lib/ruby/gems/1.9.1/gems/passenger-3.0.12/lib/phusion_passenger/classic_rails/application_spawner.rb 84 in `spawn_application'
29 /usr/lib/ruby/gems/1.9.1/gems/passenger-3.0.12/lib/phusion_passenger/spawn_manager.rb 230 in `spawn_rails_application'
30 /usr/lib/ruby/gems/1.9.1/gems/passenger-3.0.12/lib/phusion_passenger/spawn_manager.rb 132 in `spawn_application'
31 /usr/lib/ruby/gems/1.9.1/gems/passenger-3.0.12/lib/phusion_passenger/spawn_manager.rb 275 in `handle_spawn_application'
32 /usr/lib/ruby/gems/1.9.1/gems/passenger-3.0.12/lib/phusion_passenger/abstract_server.rb 357 in `server_main_loop'
33 /usr/lib/ruby/gems/1.9.1/gems/passenger-3.0.12/lib/phusion_passenger/abstract_server.rb 206 in `start_synchronously'
34 /usr/lib/ruby/gems/1.9.1/gems/passenger-3.0.12/helper-scripts/passenger-spawn-server 99 in `
'