在 `<module:Helpers>' 中：未初始化的常量 ActionView::Helpers::ActiveModelHelper (NameError)

Question

我刚刚开始学习 Ruby on Rails。我安装了所有相关软件并开始探索。当我尝试在 Rails (WEBrick) 中启动默认服务器时，出现以下错误。

C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.5/lib/action_view/helpers.rb:40:in `<module:Helpers>': uninitialized constant ActionView::Helpers::ActiveModelHelper (NameError)
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.5/lib/action_view/helpers.rb:4:in `<module:ActionView>'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.5/lib/action_view/helpers.rb:3:in `<top (required)>'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.5/lib/action_view/base.rb:5:in `require'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.5/lib/action_view/base.rb:5:in `<top (required)>'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/web-console-2.2.1/lib/web_console/template.rb:7:in `<class:Template>'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/web-console-2.2.1/lib/web_console/template.rb:6:in `<module:WebConsole>'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/web-console-2.2.1/lib/web_console/template.rb:1:in `<top (required)>'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/web-console-2.2.1/lib/web_console.rb:12:in `require'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/web-console-2.2.1/lib/web_console.rb:12:in `<top (required)>'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/web-console-2.2.1/lib/web-console.rb:1:in `require'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/web-console-2.2.1/lib/web-console.rb:1:in `<top (required)>'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler/runtime.rb:76:in `require'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler/runtime.rb:72:in `each'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler/runtime.rb:72:in `block in require'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler/runtime.rb:61:in `each'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler/runtime.rb:61:in `require'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler.rb:134:in `require'
    from C:/Temp/Rails-Project/Sites/simple_cms/config/application.rb:7:in `<top (required)>'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:78:in`require'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:78:in`block in server'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:75:in`tap'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:75:in`server'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:39:in`run_command!'
    from C:/Apps/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.5/lib/rails/commands.rb:17:in `<top (required)>'
    from bin/rails:4:in `require'
    from bin/rails:4:in `<main>'

在 SOF 中进行研究后，从 the link 和 other link 发现 nokogiri 需要在 Gemfile 中更新。我更新并执行了 Bundle Install 命令。即使在那之后，它也不起作用。请建议我解决它的方法。仅供参考，我使用的是最新版本的 gems。

我还用

更新了我的 Gemfile

gem '机架', '~> 1.6.0'

没有用。

Answer 1

安装旧版本的 rails (4.0.0) 因为我认为 windows 没有稳定版本的 rails > 4.0。 更改 gemfile 中的版本。