Ruby on Rails

Trying to run 'gem outdated' on OS X (10.6.3) and I'm getting:

sudo gem outdated
ERROR: While executing gem ... (NoMethodError)
undefined method `first' for nil:NilClass

Here's my info:

john$ gem env
RubyGems Environment:
- RUBYGEMS VERSION: 1.3.7
- RUBY VERSION: 1.8.7 (2009-06-08 patchlevel 173)
[universal-darwin10.0]
- INSTALLATION DIRECTORY: /Library/Ruby/Gems/1.8
- RUBY EXECUTABLE:
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
- EXECUTABLE DIRECTORY: /usr/bin
- RUBYGEMS PLATFORMS:
- ruby
- universal-darwin-10
- GEM PATHS:
- /Library/Ruby/Gems/1.8
- /Users/john/.gem/ruby/1.8
-
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :benchmark => false
- :backtrace => false
- :bulk_threshold => 1000
- REMOTE SOURCES:
- http://rubygems.org/

Doing a 'sudo gem update' does work fine (it just updated a couple
fine).

Anyone? Thanks.
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