switching rails versions 2.0.2 <-> 1.2.5

rubyonrails-talk
1

I'm migrating my web app to 2.0.2 . Since I needed to switch back to 1.2.5 I set RAILS_GEM_VERSION in evinroement.rb: RAILS_GEM_VERSION = '1.2.5'

But restarting the webserver I get an error related to the 2.0.2 version:

/usr/local/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/base.rb: ....

So it seems that setting RAILS_GEM_VERSION did not do the trick... Any clue?

Thank you in advance.