# Problem after rails upgrade

**URL:** <https://www.ruby-forum.com/t/problem-after-rails-upgrade/48259>\
**Category:** Ruby\
**Created:** [November 18, 2005, 8:33am UTC](https://www.ruby-forum.com/t/problem-after-rails-upgrade/48259 "2005-11-18T08:33:11Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jason.wold](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/edb3f5/32.png) [@jason.wold](https://www.ruby-forum.com/u/jason.wold)\
**Post date:** [November 18, 2005, 8:33am UTC](https://www.ruby-forum.com/t/problem-after-rails-upgrade/48259/1 "2005-11-18T08:33:11Z")

</div>

After upgrading rails (via gem update) I am getting a const\_missing  
error.

$ rails foo  
/usr/lib/ruby/gems/1.8/gems/activesupport-1.2.3/lib/active\_support/dependencies.rb:200:in  
`const_missing': uninitialized constant Mapping (NameError) from /usr/lib/ruby/gems/1.8/gems/actionwebservice-0.9.3/lib/action_web_service/protocol/soap_protocol/marshaler.rb:7 from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:18:in`require\_\_’  
from  
/usr/lib/ruby/site\_ruby/1.8/rubygems/custom\_require.rb:18:in  
`require' from /usr/lib/ruby/gems/1.8/gems/activesupport-1.2.3/lib/active_support/dependencies.rb:214:in`require’  
from  
/usr/lib/ruby/gems/1.8/gems/actionwebservice-0.9.3/lib/action\_web\_service/protocol/soap\_protocol.rb:1  
from  
/usr/lib/ruby/site\_ruby/1.8/rubygems/custom\_require.rb:18:in  
`require__' from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:18:in`require’  
from  
/usr/lib/ruby/gems/1.8/gems/activesupport-1.2.3/lib/active\_support/dependencies.rb:214:in  
`require' ... 11 levels... from /usr/lib/ruby/site_ruby/1.8/rubygems.rb:150:in`activate’  
from /usr/lib/ruby/site\_ruby/1.8/rubygems.rb:38:in  
`require_gem_with_options' from /usr/lib/ruby/site_ruby/1.8/rubygems.rb:32:in`require\_gem’  
from /usr/bin/rails:17

I’m running on FC3.

$ ruby -v  
ruby 1.8.2 (2004-12-25) [i686-linux]

Any help greatly appreciated.

Cheers,  
Jason

---

<div class="post-metadata">

**Author:** ![jason.wold](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/edb3f5/32.png) [@jason.wold](https://www.ruby-forum.com/u/jason.wold)\
**Post date:** [November 18, 2005, 9:45am UTC](https://www.ruby-forum.com/t/problem-after-rails-upgrade/48259/2 "2005-11-18T09:45:34Z")

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On 11/17/05, Jason W. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> ```
> from /usr/lib/ruby/gems/1.8/gems/activesupport-1.2.3/lib/active_support/dependencies.rb:214:in
> from /usr/lib/ruby/site_ruby/1.8/rubygems.rb:38:in
> 
> ```
> 
> `require_gem_with_options' from /usr/lib/ruby/site_ruby/1.8/rubygems.rb:32:in `require\_gem’  
> from /usr/bin/rails:17
> 
> I’m running on FC3.
> 
> $ ruby -v  
> ruby 1.8.2 (2004-12-25) [i686-linux]

To answer my own question, the new version must need a newer version  
of ruby because after I upgraded to 1.8.3 rails started working again.

Cheers,  
Jason