错误:找不到有效的gem 'libxml-ruby‘(>= 0)

Question

我有一个rails应用程序，我复制到我的机器。在访问应用程序时，我会收到以下错误。

    MissingSourceFile (no such file to load -- xml):
    app/controllers/results_controller.rb:6
    /usr/local/rvm/rubies/ruby-1.8.7-head/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
    /usr/local/rvm/rubies/ruby-1.8.7-head/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
    /usr/local/rvm/rubies/ruby-1.8.7-head/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
    /usr/local/rvm/rubies/ruby-1.8.7-head/lib/ruby/1.8/webrick/server.rb:162:in `start'
    /usr/local/rvm/rubies/ruby-1.8.7-head/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
   /usr/local/rvm/rubies/ruby-1.8.7-head/lib/ruby/1.8/webrick/server.rb:95:in `start'
   /usr/local/rvm/rubies/ruby-1.8.7-head/lib/ruby/1.8/webrick/server.rb:92:in `each'
   /usr/local/rvm/rubies/ruby-1.8.7-head/lib/ruby/1.8/webrick/server.rb:92:in `start'
   /usr/local/rvm/rubies/ruby-1.8.7-head/lib/ruby/1.8/webrick/server.rb:23:in `start'
   /usr/local/rvm/rubies/ruby-1.8.7-head/lib/ruby/1.8/webrick/server.rb:82:in `start'

我试着安装libxml，得到了以下错误：

  [root@localhost log]# gem install libxml-ruby
  WARNING:  RubyGems 1.2+ index not found for:
  RubyGems will revert to legacy indexes degrading performance.
  ERROR:  Could not find a valid gem 'libxml-ruby' (>= 0) in any repository
  [root@localhost log]#

如何解决这个问题呢？

Rails版本: 2.3.8 Ruby版本: 1.8.7操作系统: FC18

Answer 1

此错误意味着您的用户所拥有的gem源无法解析libxml-ruby。libxml-ruby似乎也是由rubygems.org托管的。因此，您可以将https://rubygems.org添加到源代码中并安装gem。

# gem sources -a https://rubygems.org
https://rubygems.org added to sources

然后安装libxml-ruby

# gem install libxml-ruby

这应该会成功地安装创业板。

为了查看可用源的列表，可以发出gem sources

# gem sources