# Can't activate activesupport (= 1.0.4), already activated

**URL:** <https://www.ruby-forum.com/t/cant-activate-activesupport-1-0-4-already-activated/107786>\
**Category:** Rails\
**Created:** [June 26, 2007, 8:54am UTC](https://www.ruby-forum.com/t/cant-activate-activesupport-1-0-4-already-activated/107786 "2007-06-26T08:54:56Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![matt](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/a6a055/32.png) [@matt](https://www.ruby-forum.com/u/matt)\
**Post date:** [June 26, 2007, 8:54am UTC](https://www.ruby-forum.com/t/cant-activate-activesupport-1-0-4-already-activated/107786/1 "2007-06-26T08:54:56Z")

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I’m encountering a problem when trying to go through the Rails4Days  
tutorial: [http://www.rails4days.pwp.blueyonder.co.uk/Rails4Days.pdf](http://www.rails4days.pwp.blueyonder.co.uk/Rails4Days.pdf). As  
the guide suggests I have downloaded the version of rails that is being  
used in the tutorial with gem and have specified the versions in  
/config/environment.rb:

# Include your application configuration below

# Require Rails libraries.

require ‘rubygems’  
gem ‘activesupport’, ‘= 1.0.4’  
gem ‘activerecord’, ‘= 1.10.1’  
gem ‘actionpack’, ‘= 1.8.1’  
gem ‘actionmailer’, ‘= 0.9.1’  
gem ‘actionwebservice’, ‘= 0.7.1’  
gem ‘rails’, ‘= 0.12.1’

When I try to execute the following command:

$ script/generate model category exists app/models/ exists test/unit/  
exists test/fixtures/ create app/models/category.rb create  
test/unit/category\_test.rb create test/fixtures/categories.yml

I receive this error:

/usr/local/lib/site\_ruby/1.8/rubygems.rb:246:in `activate': can't activate activesupport (= 1.0.4), already activated activesupport-1.4.2] (Gem::Exception) from /usr/local/lib/site_ruby/1.8/rubygems.rb:76:in `active\_gem\_with\_options’  
from /usr/local/lib/site\_ruby/1.8/rubygems.rb:50:in `gem' from ./script/../config/../config/environment.rb:64 from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:27:in `require’  
from  
/usr/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/generate.rb:1  
from  
/usr/local/lib/site\_ruby/1.8/rubygems/custom\_require.rb:27:in `require’  
from script/generate:3

I’ve tried searching google without success. Any suggestions would be  
very much appreciated as I would love to complete this tutorial.

---

<div class="post-metadata">

**Author:** ![matt](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/a6a055/32.png) [@matt](https://www.ruby-forum.com/u/matt)\
**Post date:** [June 27, 2007, 11:02am UTC](https://www.ruby-forum.com/t/cant-activate-activesupport-1-0-4-already-activated/107786/2 "2007-06-27T11:02:35Z")

</div>

bump

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<div class="post-metadata">

**Author:** ![matt](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/a6a055/32.png) [@matt](https://www.ruby-forum.com/u/matt)\
**Post date:** [December 5, 2007, 7:26pm UTC](https://www.ruby-forum.com/t/cant-activate-activesupport-1-0-4-already-activated/107786/3 "2007-12-05T19:26:52Z")

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did you ever get an answer for this?

I’m having the same problem, however mines realted to not being able  
to activate activerecord. This only appeared after I installed the  
release candidate 1.99.1 of rails.