# Switching rails versions 2.0.2 \<-\> 1.2.5

**URL:** <https://www.ruby-forum.com/t/switching-rails-versions-2-0-2-1-2-5/134806>\
**Category:** Rails\
**Created:** [April 15, 2008, 10:29am UTC](https://www.ruby-forum.com/t/switching-rails-versions-2-0-2-1-2-5/134806 "2008-04-15T10:29:28Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![deliak](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/9e8a1a/32.png) [@deliak](https://www.ruby-forum.com/u/deliak)\
**Post date:** [April 15, 2008, 10:29am UTC](https://www.ruby-forum.com/t/switching-rails-versions-2-0-2-1-2-5/134806/1 "2008-04-15T10:29:28Z")

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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.