# Can I get multiple applications with different rails versions running on one machine?(can't activat

**URL:** <https://www.ruby-forum.com/t/can-i-get-multiple-applications-with-different-rails-versions-running-on-one-machine-cant-activat/165477>\
**Category:** Rails\
**Created:** [April 14, 2009, 11:26am UTC](https://www.ruby-forum.com/t/can-i-get-multiple-applications-with-different-rails-versions-running-on-one-machine-cant-activat/165477 "2009-04-14T11:26:39Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![hei](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/779978/32.png) [@hei](https://www.ruby-forum.com/u/hei)\
**Post date:** [April 14, 2009, 11:26am UTC](https://www.ruby-forum.com/t/can-i-get-multiple-applications-with-different-rails-versions-running-on-one-machine-cant-activat/165477/1 "2009-04-14T11:26:39Z")

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I did so, details below:  
original:  
gem 1.2.0  
rails 2.0.2  
one application(call it OLD) running well  
now:  
gem 1.3.1(for rails 2.3.2’s needs)  
rails 2.0.2, 2.3.2(both exists)  
another application(just a test application, almost blank, call it  
NEW) meet errors:

/usr/local/lib/ruby/site\_ruby/1.8/rubygems.rb:149:in `activate’:  
can’t activate activerecord (= 2.0.2, runtime),  
already activated activerecord-2.3.2 (Gem::Exception)

Notice: I can’t run gem cleanup, and I don’t want change any of OLD  
(including rake rails:freeze:edge RELEASE=2.0.2)  
so I just freeze New, but still get errors.  
Can anyone help me ? Thanks a lot!

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**Author:** ![hei](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/779978/32.png) [@hei](https://www.ruby-forum.com/u/hei)\
**Post date:** [April 14, 2009, 4:41pm UTC](https://www.ruby-forum.com/t/can-i-get-multiple-applications-with-different-rails-versions-running-on-one-machine-cant-activat/165477/2 "2009-04-14T16:41:27Z")

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Have you tried to freeze rails into the project?

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**Author:** ![hei](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/779978/32.png) [@hei](https://www.ruby-forum.com/u/hei)\
**Post date:** [April 14, 2009, 7:03pm UTC](https://www.ruby-forum.com/t/can-i-get-multiple-applications-with-different-rails-versions-running-on-one-machine-cant-activat/165477/3 "2009-04-14T19:03:50Z")

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hei wrote:  
[…]

> Notice: I can’t run gem cleanup, and I don’t want change any of OLD  
> (including rake rails:freeze:edge RELEASE=2.0.2)  
> so I just freeze New, but still get errors.  
> Can anyone help me ? Thanks a lot!

Does the environment.rb file on OLD contain the correct  
RAILS\_GEM\_VERSION?

## Best,

Marnen Laibow-Koser  
[http://www.marnen.org](http://www.marnen.org)  
removed\_email\_address@domain.invalid

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**Author:** ![hei](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/779978/32.png) [@hei](https://www.ruby-forum.com/u/hei)\
**Post date:** [April 15, 2009, 5:05am UTC](https://www.ruby-forum.com/t/can-i-get-multiple-applications-with-different-rails-versions-running-on-one-machine-cant-activat/165477/4 "2009-04-15T05:05:28Z")

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Got it!  
\<1\> cp /PATH/TO/ACTIVERECORD2.0.2/…/oci\_adapter.rb /PATH/TO/  
ACTIVERECORD2.3.2/…/oci\_apapter.rb  
\<2\>cp /PATH/TO/ACTIVERECORD2.0.2/…/oci\_adapter.rb /PATH/TO/VENDER/  
ACTIVERECORD2.3.2/…/oci\_apapter.rb  
And all works well~~~

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<div class="post-metadata">

**Author:** ![hei](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/779978/32.png) [@hei](https://www.ruby-forum.com/u/hei)\
**Post date:** [April 15, 2009, 4:25am UTC](https://www.ruby-forum.com/t/can-i-get-multiple-applications-with-different-rails-versions-running-on-one-machine-cant-activat/165477/5 "2009-04-15T04:25:41Z")

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OLD just run well.  
I think it’s because the oci adapter, I install it with activerecord  
2.0.2.  
I will try to install a new one with activerecord 2.3.2, hope both of  
them can coexist.  
Thanks~

On Apr 15, 1:03 am, Marnen Laibow-Koser \<rails-mailing-l…@andreas-