rails 报错"We're sorry, but something went wrong."

58383788 — Sat, 23 May 2015 11:23:05 +0800

大家好，我是一个新人在学习 ror. 从开始做到现在一直都好好的，中间也有过各种报错，自己学会了查看 Log,google+stackoverflow 可以解决。不过昨天碰到的这个问题真是令人蛋碎了.折腾一整天了。还是没有任何办法. 教材用的是安道 ruby on rails tutorial 中文第三版，到第九章第三节，"列出所有用户",即是在首页点击"Users"标签可以查看所创建的所有用户，我的代码和书上保持完全一致. 并且在设立用户的时候，没有采用中文用户名，全是英文用户名。这是报错的页面

运行 rails 的环境背景是 mac os 10.10.3,

gem 列表为

gem 'rails',                '4.2.0'
gem 'bcrypt',               '3.1.7'
gem 'bootstrap-sass'
gem 'sass-rails',           '5.0.0.beta1'
gem 'uglifier',             '2.5.3'
gem 'coffee-rails',         '4.1.0'
gem 'jquery-rails',         '4.0.0.beta2'
gem 'turbolinks',           '2.3.0'
gem 'jbuilder',             '2.2.3'
gem 'sdoc',                 '0.4.0', group: :doc

group :development, :test do
  gem 'sqlite3',     '1.3.9'
  gem 'byebug',      '3.4.0'
  gem 'web-console', '2.0.0.beta3'
  gem 'spring',      '1.1.3'
end

group :test do
  gem 'minitest-reporters', '1.0.5'
  gem 'mini_backtrace',     '0.1.3'
  gem 'guard-minitest',     '2.3.1'
end

group :production do
  gem 'pg',             '0.17.1'
  gem 'rails_12factor', '0.0.2'
  gem 'puma',           '2.11.1'
end

rals -s -e development 下. 终端显示为

Started GET "/users" for ::1 at 2015-05-23 11:05:07 +0800
Processing by UsersController#index as HTML
  User Load (0.2ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1  [["id", 1]]
  User Load (0.3ms)  SELECT "users".* FROM "users"
  Rendered users/index.html.erb within layouts/application (5.3ms)
Completed 500 Internal Server Error in 13ms

查看 development.log，得到

Started GET "/users" for ::1 at 2015-05-23 11:05:07 +0800
Processing by UsersController#index as HTML
  [1m[36mUser Load (0.2ms)[0m  [1mSELECT  "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1[0m  [["id", 1]]
  [1m[35mUser Load (0.3ms)[0m  SELECT "users".* FROM "users"
  Rendered users/index.html.erb within layouts/application (5.3ms)
Completed 500 Internal Server Error in 13ms

请问我的问题出在哪里呢？

58383788 (徐世成)

rails 报错"We're sorry, but something went wrong."