# Acts\_as\_taggable Rails 2.0

**URL:** <https://www.ruby-forum.com/t/acts-as-taggable-rails-2-0/128663>\
**Category:** Rails\
**Created:** [February 10, 2008, 12:28am UTC](https://www.ruby-forum.com/t/acts-as-taggable-rails-2-0/128663 "2008-02-10T00:28:45Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![arte\_fact](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/22d042/32.png) [@arte\_fact](https://www.ruby-forum.com/u/arte_fact)\
**Post date:** [February 10, 2008, 12:28am UTC](https://www.ruby-forum.com/t/acts-as-taggable-rails-2-0/128663/1 "2008-02-10T00:28:45Z")

</div>

Helleo,

I’m currently in trouble with acts\_as\_taggable, indeed, the system  
raises this kind of error in Rail 2.0.2. But this works with Rails  
1.2.3.

I do not know how to fix it. It seems that something is connected to  
the Rails version.

have you hot any clues about what the problem could be?

Thanks in advance.

Arte\_fact

NameError (undefined local variable or method `acts_as_taggable' for Book:Class): /var/lib/gems/1.8/gems/activerecord-1.15.3/lib/active_record/ base.rb:1235:in`method\_missing’  
/app/models/book.rb:2  
/usr/lib/ruby/1.8/rubygems/custom\_require.rb:27:in  
`gem_original_require' /usr/lib/ruby/1.8/rubygems/custom_require.rb:27:in`require’  
/var/lib/gems/1.8/gems/activesupport-1.4.2/lib/active\_support/  
dependencies.rb:495:in `require' /var/lib/gems/1.8/gems/activesupport-1.4.2/lib/active_support/ dependencies.rb:342:in`new\_constants\_in’  
/var/lib/gems/1.8/gems/activesupport-1.4.2/lib/active\_support/  
dependencies.rb:495:in `require' /var/lib/gems/1.8/gems/activesupport-1.4.2/lib/active_support/ dependencies.rb:104:in`require\_or\_load’  
/var/lib/gems/1.8/gems/activesupport-1.4.2/lib/active\_support/  
dependencies.rb:248:in `load_missing_constant' /var/lib/gems/1.8/gems/activesupport-1.4.2/lib/active_support/ dependencies.rb:452:in`const\_missing’  
/var/lib/gems/1.8/gems/activesupport-1.4.2/lib/active\_support/  
dependencies.rb:464:in `const_missing' /var/lib/gems/1.8/gems/activesupport-1.4.2/lib/active_support/ inflector.rb:250:in`constantize’  
/var/lib/gems/1.8/gems/activesupport-1.4.2/lib/active\_support/  
core\_ext/string/inflections.rb:148:in `constantize' /var/lib/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/ pagination.rb:195:in`paginator\_and\_collection\_for’  
/var/lib/gems/1.8/gems/actionpack-1.13.3/lib/action\_controller/  
pagination.rb:130:in `paginate’  
/app/controllers/admin/publisher\_controller.rb:90