bundle exec spork error need help

Using RSpec, Rails

Preloading Rails environment

undefined method `generators’ for #Rails::Railtie::Configuration:0x0000000339a898 (NoMethodError)

/home/rorway/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/railtie/configuration.rb:95:in `method_missing’

/home/rorway/.rvm/gems/ruby-2.1.2/gems/rspec-rails-2.0.0.beta.18/lib/rspec-rails.rb:4:in `class:Railtie

/home/rorway/.rvm/gems/ruby-2.1.2/gems/rspec-rails-2.0.0.beta.18/lib/rspec-rails.rb:3:in `module:Rails

/home/rorway/.rvm/gems/ruby-2.1.2/gems/rspec-rails-2.0.0.beta.18/lib/rspec-rails.rb:2:in `module:RSpec

/home/rorway/.rvm/gems/ruby-2.1.2/gems/rspec-rails-2.0.0.beta.18/lib/rspec-rails.rb:1:in `<top (required)>’

/home/rorway/.rvm/gems/ruby-2.1.2@global/gems/bundler-1.6.2/lib/bundler/runtime.rb:76:in `require’

/home/rorway/.rvm/gems/ruby-2.1.2@global/gems/bundler-1.6.2/lib/bundler/runtime.rb:76:in `block (2 levels) in require’

/home/rorway/.rvm/gems/ruby-2.1.2@global/gems/bundler-1.6.2/lib/bundler/runtime.rb:72:in `each’

/home/rorway/.rvm/gems/ruby-2.1.2@global/gems/bundler-1.6.2/lib/bundler/runtime.rb:72:in `block in require’

/home/rorway/.rvm/gems/ruby-2.1.2@global/gems/bundler-1.6.2/lib/bundler/runtime.rb:61:in `each’

/home/rorway/.rvm/gems/ruby-2.1.2@global/gems/bundler-1.6.2/lib/bundler/runtime.rb:61:in `require’

/home/rorway/.rvm/gems/ruby-2.1.2@global/gems/bundler-1.6.2/lib/bundler.rb:132:in `require’

/home/rorway/sample_app/config/application.rb:14:in `<top (required)>’

/home/rorway/.rvm/gems/ruby-2.1.2/gems/spork-rails-4.0.0/lib/spork/app_framework/rails.rb:49:in `require’

/home/rorway/.rvm/gems/ruby-2.1.2/gems/spork-rails-4.0.0/lib/spork/app_framework/rails.rb:49:in `preload_rails’

/home/rorway/.rvm/gems/ruby-2.1.2/gems/spork-rails-4.0.0/lib/spork/app_framework/rails.rb:7:in `preload’

/home/rorway/.rvm/gems/ruby-2.1.2/gems/spork-1.0.0rc4/lib/spork/test_framework.rb:134:in `block in preload’

/home/rorway/.rvm/gems/ruby-2.1.2/gems/spork-1.0.0rc4/lib/spork.rb:62:in `exec_prefork’

/home/rorway/.rvm/gems/ruby-2.1.2/gems/spork-1.0.0rc4/lib/spork/test_framework.rb:120:in `preload’

/home/rorway/.rvm/gems/ruby-2.1.2/gems/spork-1.0.0rc4/lib/spork/run_strategy/forking.rb:25:in `preload’

/home/rorway/.rvm/gems/ruby-2.1.2/gems/spork-1.0.0rc4/lib/spork/runner.rb:75:in `run’

/home/rorway/.rvm/gems/ruby-2.1.2/gems/spork-1.0.0rc4/lib/spork/runner.rb:10:in `run’

/home/rorway/.rvm/gems/ruby-2.1.2/gems/spork-1.0.0rc4/bin/spork:10:in `<top (required)>’

/home/rorway/.rvm/gems/ruby-2.1.2/bin/spork:23:in `load’

/home/rorway/.rvm/gems/ruby-2.1.2/bin/spork:23:in `’

/home/rorway/.rvm/gems/ruby-2.1.2/bin/ruby_executable_hooks:15:in `eval’

/home/rorway/.rvm/gems/ruby-2.1.2/bin/ruby_executable_hooks:15:in `’