Ember rails on variant

error.txt

/home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/railties-3.2.8/lib/rails/railtie/configuration.rb:85:in `method_missing': undefined method `ember' for #<Rails::Application::Configuration:0x00000003e46710> (NoMethodError)
	from /home/mserie/deploy/releases/20120926173019/config/environments/production.rb:63:in `block in <top (required)>'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/railties-3.2.8/lib/rails/railtie/configurable.rb:24:in `class_eval'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/railties-3.2.8/lib/rails/railtie/configurable.rb:24:in `configure'
	from /home/mserie/deploy/releases/20120926173019/config/environments/production.rb:1:in `<top (required)>'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `block in require'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:236:in `load_dependency'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/railties-3.2.8/lib/rails/engine.rb:571:in `block in <class:Engine>'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/railties-3.2.8/lib/rails/initializable.rb:30:in `instance_exec'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/railties-3.2.8/lib/rails/initializable.rb:30:in `run'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/railties-3.2.8/lib/rails/initializable.rb:55:in `block in run_initializers'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/railties-3.2.8/lib/rails/initializable.rb:54:in `each'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/railties-3.2.8/lib/rails/initializable.rb:54:in `run_initializers'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/railties-3.2.8/lib/rails/application.rb:136:in `initialize!'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/railties-3.2.8/lib/rails/railtie/configurable.rb:30:in `method_missing'
	from /home/mserie/deploy/releases/20120926173019/config/environment.rb:5:in `<top (required)>'
	from config.ru:4:in `require'
	from config.ru:4:in `block in <main>'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/rack-1.4.1/lib/rack/builder.rb:51:in `instance_eval'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/rack-1.4.1/lib/rack/builder.rb:51:in `initialize'
	from config.ru:1:in `new'
	from config.ru:1:in `<main>'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/unicorn-4.3.1/lib/unicorn.rb:44:in `eval'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/unicorn-4.3.1/lib/unicorn.rb:44:in `block in builder'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/unicorn-4.3.1/lib/unicorn/http_server.rb:696:in `call'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/unicorn-4.3.1/lib/unicorn/http_server.rb:696:in `build_app!'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/unicorn-4.3.1/lib/unicorn/http_server.rb:136:in `start'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/gems/unicorn-4.3.1/bin/unicorn:121:in `<top (required)>'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/bin/unicorn:23:in `load'
	from /home/mserie/.rvm/gems/ruby-1.9.3-p194@minhaserie/bin/unicorn:23:in `<main>'