Gemspec howto
Some time ago Yehuda Katz wrote a useful short introduction on how to make Ruby gems
http://yehudakatz.com/2010/04/02/using-gemspecs-as-intended/
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Gemspec howto
Some time ago Yehuda Katz wrote a useful short introduction on how to make Ruby gems
http://yehudakatz.com/2010/04/02/using-gemspecs-as-intended/

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Fixing Invalid gemspec. #
For fixing this type of error follow the following steps:
Invalid gemspec in [/usr/lib/ruby/gems/1.8/specifications/activemodel-3.2.0.rc1.gemspec]: Illformed requirement ["#<YAML::Syck::DefaultKey:0xb664a594> 3.2.0.rc1"] Invalid gemspec in [/usr/lib/ruby/gems/1.8/specifications/tilt-1.3.3.gemspec]: invalid date format in specification: "2011-08-25 00:00:00.000000000Z" Invalid gemspec in [/usr/lib/ruby/gems/1.8/specifications/actionpack-3.2.0.rc1.gemspec]: Illformed requirement ["#<YAML::Syck::DefaultKey:0xb668700c> 3.2.0.rc1"] Invalid gemspec in [/usr/lib/ruby/gems/1.8/specifications/json-1.6.1.gemspec]: invalid date format in specification: "2011-09-18 00:00:00.000000000Z" Invalid gemspec in [/usr/lib/ruby/gems/1.8/specifications/dm-serializer-1.2.1.gemspec]: invalid date format in specification: "2011-10-24 00:00:00.000000000Z" Invalid gemspec in [/usr/lib/ruby/gems/1.8/specifications/railties-3.2.0.rc1.gemspec]: Illformed requirement ["#<YAML::Syck::DefaultKey:0xb66cc79c> 3.2.0.rc1"] Invalid gemspec in [/usr/lib/ruby/gems/1.8/specifications/json_pure-1.6.1.gemspec]: invalid date format in specification: "2011-09-18 00:00:00.000000000Z" 1.8.13
1) gem update --system
2) gem uninstall rails -v 3.2.0.rc1
3) remove the gemspec file which is located on [/usr/lib/ruby/gems/1.8/specifications/..]
Problem:
invalid date format in specification: "2011-11-10 00:00:00.000000000Z
Solution:
Edit gemspec files by opening an admin "session": edit from 2011-11-10 00:00:00.000000000Z to 2011-11-10