Why will this Rails Gem will not freeze?

I have added the following to my envir开发者_如何学编程onment.rb:

config.gem "json", :version => '>=1.2.3'

When I run

rake rails:freeze:gems

the json gem does not install. I get

Freezing to the gems for Rails 2.3.8
rm -rf vendor/rails
mkdir -p vendor/rails
cd vendor/rails
Unpacked gem: '/Users/chad/www/aromapersona.localhost/vendor/rails/activesupport-2.3.8'
mv activesupport-2.3.8 activesupport
Unpacked gem: '/Users/chad/www/aromapersona.localhost/vendor/rails/activerecord-2.3.8'
mv activerecord-2.3.8 activerecord
Unpacked gem: '/Users/chad/www/aromapersona.localhost/vendor/rails/actionpack-2.3.8'
mv actionpack-2.3.8 actionpack
Unpacked gem: '/Users/chad/www/aromapersona.localhost/vendor/rails/actionmailer-2.3.8'
mv actionmailer-2.3.8 actionmailer
Unpacked gem: '/Users/chad/www/aromapersona.localhost/vendor/rails/activeresource-2.3.8'
mv activeresource-2.3.8 activeresource
Unpacked gem: '/Users/chad/www/aromapersona.localhost/vendor/rails/rails-2.3.8'
cd -

I have also tried

rake gems:unpack:dependencies

and

rake gems:unpack

but I get no output, and the gem still is not installed.

Am I running the wrong command? Am I misunderstanding something?

Note: I already have some gems installed at vendor/gems. I don't remember how I did this.

Found the answer here.

cd vendor/gems
gem unpack active_support