我的Rails应用程序启动但是给了我一个No Method错误。我不确定什么方法显然被调用的东西没有。它可以是某个网站页面，因为它发生在我尝试访问的每个网址上。任何人都能暗示哪里失败了？
完整堆栈日志：
vendor/ruby/1.9.1/gems/better_errors-0.0.8/lib/better_errors/error_frame.rb:7:in `block in from_exception'
vendor/ruby/1.9.1/gems/better_errors-0.0.8/lib/better_errors/error_frame.rb:4:in `each'
vendor/ruby/1.9.1/gems/better_errors-0.0.8/lib/better_errors/error_frame.rb:4:in `each_with_index'
vendor/ruby/1.9.1/gems/better_errors-0.0.8/lib/better_errors/error_frame.rb:4:in `each'
vendor/ruby/1.9.1/gems/better_errors-0.0.8/lib/better_errors/error_frame.rb:4:in `map'
vendor/ruby/1.9.1/gems/better_errors-0.0.8/lib/better_errors/error_frame.rb:4:in `from_exception'
vendor/ruby/1.9.1/gems/better_errors-0.0.8/lib/better_errors/error_page.rb:45:in `backtrace_frames'
vendor/ruby/1.9.1/gems/better_errors-0.0.8/lib/better_errors/middleware.rb:31:in `log_exception'
vendor/ruby/1.9.1/gems/better_errors-0.0.8/lib/better_errors/middleware.rb:23:in `rescue in app_call'
vendor/ruby/1.9.1/gems/better_errors-0.0.8/lib/better_errors/middleware.rb:20:in `app_call'
vendor/ruby/1.9.1/gems/better_errors-0.0.8/lib/better_errors/middleware.rb:14:in `call'
vendor/ruby/1.9.1/gems/bullet-4.1.5/lib/bullet/rack.rb:11:in `call'
vendor/ruby/1.9.1/gems/sass-3.2.0/lib/sass/plugin/rack.rb:54:in `call'
vendor/ruby/1.9.1/gems/actionpack-3.2.8/lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
vendor/ruby/1.9.1/gems/rack-1.4.1/lib/rack/etag.rb:23:in `call'
vendor/ruby/1.9.1/gems/rack-1.4.1/lib/rack/conditionalget.rb:25:in `call'
vendor/ruby/1.9.1/gems/actionpack-3.2.8/lib/action_dispatch/middleware/head.rb:14:in `call'
vendor/ruby/1.9.1/gems/actionpack-3.2.8/lib/action_dispatch/middleware/params_parser.rb:21:in `call'
vendor/ruby/1.9.1/gems/actionpack-3.2.8/lib/action_dispatch/middleware/flash.rb:242:in `call'
vendor/ruby/1.9.1/gems/rack-1.4.1/lib/rack/session/abstract/id.rb:205:in `context'
vendor/ruby/1.9.1/gems/rack-1.4.1/lib/rack/session/abstract/id.rb:200:in `call'
vendor/ruby/1.9.1/gems/actionpack-3.2.8/lib/action_dispatch/middleware/cookies.rb:339:in `call'
vendor/ruby/1.9.1/gems/activerecord-3.2.8/lib/active_record/query_cache.rb:64:in `call'
vendor/ruby/1.9.1/gems/activerecord-3.2.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:473:in `call'
vendor/ruby/1.9.1/gems/actionpack-3.2.8/lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
vendor/ruby/1.9.1/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:405:in `_run__2841213657923326046__call__4410644436419050805__callbacks'
vendor/ruby/1.9.1/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:405:in `__run_callback'
vendor/ruby/1.9.1/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
vendor/ruby/1.9.1/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:81:in `run_callbacks'
vendor/ruby/1.9.1/gems/actionpack-3.2.8/lib/action_dispatch/middleware/callbacks.rb:27:in `call'
vendor/ruby/1.9.1/gems/actionpack-3.2.8/lib/action_dispatch/middleware/reloader.rb:65:in `call'
vendor/ruby/1.9.1/gems/actionpack-3.2.8/lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
vendor/ruby/1.9.1/gems/actionpack-3.2.8/lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
vendor/ruby/1.9.1/gems/actionpack-3.2.8/lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
vendor/ruby/1.9.1/gems/railties-3.2.8/lib/rails/rack/logger.rb:26:in `call_app'
vendor/ruby/1.9.1/gems/railties-3.2.8/lib/rails/rack/logger.rb:16:in `call'
vendor/ruby/1.9.1/gems/actionpack-3.2.8/lib/action_dispatch/middleware/request_id.rb:22:in `call'
vendor/ruby/1.9.1/gems/rack-1.4.1/lib/rack/methodoverride.rb:21:in `call'
vendor/ruby/1.9.1/gems/rack-1.4.1/lib/rack/runtime.rb:17:in `call'
vendor/ruby/1.9.1/gems/activesupport-3.2.8/lib/active_support/cache/strategy/local_cache.rb:72:in `call'
vendor/ruby/1.9.1/gems/rack-1.4.1/lib/rack/lock.rb:15:in `call'
vendor/ruby/1.9.1/gems/actionpack-3.2.8/lib/action_dispatch/middleware/static.rb:62:in `call'
vendor/ruby/1.9.1/gems/railties-3.2.8/lib/rails/engine.rb:479:in `call'
vendor/ruby/1.9.1/gems/railties-3.2.8/lib/rails/application.rb:223:in `call'
vendor/ruby/1.9.1/gems/rack-1.4.1/lib/rack/content_length.rb:14:in `call'
vendor/ruby/1.9.1/gems/railties-3.2.8/lib/rails/rack/log_tailer.rb:17:in `call'
vendor/ruby/1.9.1/gems/rack-1.4.1/lib/rack/handler/webrick.rb:59:in `service'
/Users/<user>/.rbenv/versions/1.9.3-p362/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
/Users/<user>/.rbenv/versions/1.9.3-p362/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
/Users/<user>/.rbenv/versions/1.9.3-p362/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'
给出错误：
NoMethodError in PagesController#home
undefined method `[]' for nil:NilClass
答案 0 :(得分：1)
我相信你已经超越了这个但只是为了插话，我有同样的错误。我注释掉了better_errors gem，重新捆绑，重新启动了我的应用程序，发现我在其他地方遇到了错误。我不知道为什么better_errors无法处理它，但是一旦我修复了其他错误，我重新启用了better_errors，一切都恢复正常。
这是奇怪的b / c之前我没有遇到任何宝石问题。我喜欢它。