尝试在 Ruby on Rails 中生成 devise:install 时出错

我是 Ruby on Rails 的新手，我尝试从互联网上做一些示例。但是当我尝试生成设备安装时出现错误。 我通过添加修改了 Gemfile宝石设计。然后运行：

bundle install

但当我跑步时。

rails generate devise:install

我遇到了下一个错误：

/usr/local/lib/ruby/gems/0.9.1/gems/devise-1.1.3/lib/devise.rb:193:in `mailer=': undefined method `ref' for ActiveSupport::Dependencies:Module (NoMethodError)
    from /usr/local/lib/ruby/gems/1.9.1/gems/devise-1.1.3/lib/devise.rb:195:in `<module:Devise>'
    from /usr/local/lib/ruby/gems/1.9.1/gems/devise-1.1.3/lib/devise.rb:4:in `<top (required)>'
    from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `require'
    from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `block (2 levels) in require'
    from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `each'
    from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `block in require'
    from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `each'
    from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `require'
    from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.3.5/lib/bundler.rb:132:in `require'
    from /home/mihai/Desktop/blog/config/application.rb:7:in `<top (required)>'
    from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.13/lib/rails/commands.rb:24:in `require'
    from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.13/lib/rails/commands.rb:24:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

请帮我！

Devise 的版本相当旧。

你可以做：

bundle update devise

进而：

bundle install

这应该会升级 Devise 宝石。