Rails - Feb 2007 - Cannot find gem for Rails

I''ve been working with Ruby on Rails through Locomotive for the past
year or so, but for this particular task, I need to run a Rails
application outside the Locomotive environment. I can create a Rails
application just fine, using "rails my_app", and it boots up properly
in Mongrel, but whenever I run rake to migrate my database, I get the
following error:

 Cannot find gem for Rails ~>1.2.2.0:
    Install the missing gem with ''gem install -v=1.2.2 rails'',
or
    change environment.rb to define RAILS_GEM_VERSION with your
desired version.

I have tried everything I can think of: re-installing Rails with gems
by copying-and-pasting the line above into the terminal (as superuser
of course), pasting the rails_gem =
Gem.cache.search(''rails''... line
from my boot.rb into irb (which does execute correctly), but I still
can''t get rake to run. Does anyone have any tips?

Thank you very much,
-Ryan

System configuration:

G4 PowerBook, with OS X 10.4.8.
I''ve installed Ruby, Gems, and Rails:
  rschenk$ ruby -v
  ruby 1.8.5 (2006-12-25 patchlevel 12) [powerpc-darwin8.8.0]
  rschenk$ gem -v
  0.9.2
  rschenk$ rails -v
  Rails 1.2.2

When I type ./script/about:
  About your application''s environment
  Ruby version                 1.8.5 (powerpc-darwin8.8.0)
  RubyGems version             0.9.2
  Rails version                1.2.2
  Active Record version        1.15.2
  Action Pack version          1.13.2
  Action Web Service version   1.2.2
  Action Mailer version        1.3.2
  Active Support version       1.4.1
  Application root             /Users/rschenk/Desktop/
simple_rails_test
  Environment                  development
  Database adapter             mysql


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