使用ruby gems时出错

我最近使用gem安装了一个基于ruby的工具，当我尝试运行这些工具时，我得到了以下错误。我如何解决它

 Invalid gemspec in [/var/lib/gems/1.8/specifications/commander-4.1.2.gemspec]: invalid date format in specification: "2012-02-17 00:00:00.000000000Z"
    /usr/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:53:in `gem_original_require': no such file to load -- commander/user_interaction (LoadError)
        from /usr/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:53:in `require'
        from /var/lib/gems/1.8/gems/rhc-0.93.19/lib/rhc/helpers.rb:1
        from /usr/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:53:in `gem_original_require'
        from /usr/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:53:in `require'
        from /var/lib/gems/1.8/gems/rhc-0.93.19/lib/rhc-rest.rb:11
        from /usr/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:53:in `gem_original_require'
        from /usr/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:53:in `require'
        from /var/lib/gems/1.8/gems/rhc-0.93.19/lib/rhc-common.rb:12
        from /usr/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:53:in `gem_original_require'
        from /usr/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:53:in `require'
        from /var/lib/gems/1.8/gems/rhc-0.93.19/bin/rhc:7
        from /usr/local/bin/rhc:19:in `load'
        from /usr/local/bin/rhc:19

我按照下面的答案安装了commander，当我现在尝试运行时，它会给我以下错误-

Invalid gemspec in [/var/lib/gems/1.8/specifications/commander-4.1.2.gemspec]: invalid date format in specification: "2012-02-17 00:00:00.000000000Z"
/usr/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:53:in `gem_original_require': no such file to load -- commander/user_interaction (LoadError)
    from /usr/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:53:in `require'
    from /var/lib/gems/1.8/gems/rhc-0.93.19/lib/rhc/helpers.rb:1
    from /usr/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:53:in `gem_original_require'
    from /usr/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:53:in `require'
    from /var/lib/gems/1.8/gems/rhc-0.93.19/lib/rhc-rest.rb:11
    from /usr/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:53:in `gem_original_require'
    from /usr/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:53:in `require'
    from /var/lib/gems/1.8/gems/rhc-0.93.19/lib/rhc-common.rb:12
    from /usr/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:53:in `gem_original_require'
    from /usr/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:53:in `require'
    from /var/lib/gems/1.8/gems/rhc-0.93.19/bin/rhc:7
    from /usr/local/bin/rhc:19:in `load'
    from /usr/local/bin/rhc:19

我猜，你在用gem。请安装在

gem install commander

---

版本是4.1.1

Shamith谢谢，不过我现在正试图通过rvm安装ruby。看来安装已经完成了。