Rails - Nov 2007 - Can't update ActiveSupport gem

I''m getting the message

ERROR:  While executing gem ... (ArgumentError)
string contains null byte

My RAILS implementation is now completely out of sync.  All other gems
are updated to latest except ActiveSupport.  rake rails:update:configs
is aborting because ActiveSupport is wrong version.

Any help would be appreciated!
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Now I''m totally hosed.  I tried to reinstate an older version of
RAILS, and I can''t start my server.  The error I''m getting is:

Exiting
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.4.3/lib/
active_support/dependencies.rb:477:in `const_missing'': uninitialized
constant Gem::Version::NUM_RE (NameError)
        from /usr/local/lib/ruby/gems/1.8/gems/loaded_plugins-0.1.2/
lib/loaded_plugins/plugin.rb:19:in `name_for''
        from /usr/local/lib/ruby/gems/1.8/gems/loaded_plugins-0.1.2/
lib/loaded_plugins/plugin.rb:27:in `initialize''
        from /usr/local/lib/ruby/gems/1.8/gems/loaded_plugins-0.1.2/
lib/loaded_plugins/extensions/initializer.rb:23:in `new''
        from /usr/local/lib/ruby/gems/1.8/gems/loaded_plugins-0.1.2/
lib/loaded_plugins/extensions/initializer.rb:23:in `load_plugin''
        from /usr/local/lib/ruby/gems/1.8/gems/rails-1.2.4/lib/
initializer.rb:189:in `load_plugins''
        from /usr/local/lib/ruby/gems/1.8/gems/rails-1.2.4/lib/
initializer.rb:189:in `each''
        from /usr/local/lib/ruby/gems/1.8/gems/rails-1.2.4/lib/
initializer.rb:189:in `load_plugins''
        from /usr/local/lib/ruby/gems/1.8/gems/rails-1.2.4/lib/
initializer.rb:109:in `process''
         ... 29 levels...
        from /usr/local/lib/ruby/gems/1.8/gems/rails-1.2.4/lib/
commands/server.rb:39
        from /usr/local/lib/ruby/site_ruby/1.8/rubygems/
custom_require.rb:27:in `gem_original_require''
        from /usr/local/lib/ruby/site_ruby/1.8/rubygems/
custom_require.rb:27:in `require''
        from script/server:3

Help please!
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Fixed.

Don''t know what happened but reinstalling ruby gems did the trick.
Running now on rails 1.2.4.  Still have question about download
failure of Rails 1.2.6 gem.
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