我最近使用gem安装了基于ruby的工具，当我尝试运行这些工具时，我收到以下错误。我该如何解决？
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
我根据下面的答案安装了指挥官，当我尝试现在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