rail中flickr的应用

刚学rails照着netbeans里的例子做一个flickr的应用http://zh-cn.netbeans.org/kb/60/ruby/flickr-on-rails.html但是一运行就报错.错误如下:

JRuby limited openssl loaded. gem install jruby-openssl for full support.
http://wiki.jruby.org/wiki/JRuby_Builtin_OpenSSL
D:/Program Files/NetBeans 6.1/ruby2/jruby-1.1/lib/ruby/site_ruby/1.8/rubygems.rb:379:in `report_activate_error': Could not find RubyGem xml-simple (>= 1.0.7) (Gem::LoadError)

        from D:/Program Files/NetBeans 6.1/ruby2/jruby-1.1/lib/ruby/site_ruby/1.8/rubygems.rb:311:in `activate'
        from D:/Program Files/NetBeans 6.1/ruby2/jruby-1.1/lib/ruby/site_ruby/1.8/rubygems.rb:337:in `activate'
        from D:/Program Files/NetBeans 6.1/ruby2/jruby-1.1/lib/ruby/site_ruby/1.8/rubygems.rb:336:in `each'
        from D:/Program Files/NetBeans 6.1/ruby2/jruby-1.1/lib/ruby/site_ruby/1.8/rubygems.rb:336:in `activate'
        from D:/Program Files/NetBeans 6.1/ruby2/jruby-1.1/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
        from D:/Program Files/NetBeans 6.1/ruby2/jruby-1.1/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:496:in `require'
.................

是因为我加了这样一句话require 'flickr'但是我已经在gems里安装了flickr的包呀..为什么还会这样?