Ruby on rails [rails中的控制台]。未初始化常量类

当我在rails的终端中运行一个方法时。 第一次，它起作用了：

 Spree::Campaign.first
 Campaign Load (0.4ms)  SELECT  `campaigns`.* FROM `campaigns`   ORDER BY `campaigns`.`id` ASC LIMIT 1
 => #<Campaign id: 1, name: "campaign 1", user_id: 1, created_at: "2015-10-27 06:48:01", updated_at: "2015-10-29 04:22:03", description: nil, active: true>

但当我再次尝试运行上面的代码时

Spree::Campaign.first
NameError: uninitialized constant Spree::Campaign
from (irb):2
from /home/kop/.rvm/gems/ruby-2.1.4@rails3213/gems/railties-4.1.6/lib/rails/commands/console.rb:90:in `start'
from /home/kop/.rvm/gems/ruby-2.1.4@rails3213/gems/railties-4.1.6/lib/rails/commands/console.rb:9:in `start'
from /home/kop/.rvm/gems/ruby-2.1.4@rails3213/gems/railties-4.1.6/lib/rails/commands/commands_tasks.rb:69:in `console'
from /home/kop/.rvm/gems/ruby-2.1.4@rails3213/gems/railties-4.1.6/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
from /home/kop/.rvm/gems/ruby-2.1.4@rails3213/gems/railties-4.1.6/lib/rails/commands.rb:17:in `<top (required)>'
from /home/kop/.rvm/gems/ruby-2.1.4@rails3213/gems/polyglot-0.3.5/lib/polyglot.rb:65:in `require'
from /home/kop/.rvm/gems/ruby-2.1.4@rails3213/gems/polyglot-0.3.5/lib/polyglot.rb:65:in `require'
from /home/kop/rails/donghoxteen/bin/rails:8:in `<top (required)>'
from /home/kop/.rvm/rubies/ruby-2.1.4/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from /home/kop/.rvm/rubies/ruby-2.1.4/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from -e:1:in `<main>'

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为什么?？如何修复此错误？？？

您所遇到的错误似乎是间歇性的。在问题文本中，错误为未初始化常量Spree:：Campaign，而在问题标题中，错误为未初始化常量类

这表明您的Ruby安装存在根本性的问题。类是一个核心Ruby类，类常量应该始终存在。仅凭您提供的信息很难进行诊断，但在您的Ruby安装中，常量查找似乎被破坏了

---

我建议重新安装Ruby。

您是否在项目目录的rails控制台中运行Spree:：Campaign.first？它第一次起作用，第二次不起作用？是的。如何修复错误？