# WARNING: YAML.add\_builtin\_type is not implemented

**URL:** <https://www.ruby-forum.com/t/warning-yaml-add-builtin-type-is-not-implemented/191875>\
**Category:** IronRuby\
**Created:** [July 20, 2010, 3:58am UTC](https://www.ruby-forum.com/t/warning-yaml-add-builtin-type-is-not-implemented/191875 "2010-07-20T03:58:49Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![michbukana](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/4af34b/32.png) [@michbukana](https://www.ruby-forum.com/u/michbukana)\
**Post date:** [July 20, 2010, 3:58am UTC](https://www.ruby-forum.com/t/warning-yaml-add-builtin-type-is-not-implemented/191875/1 "2010-07-20T03:58:49Z")

</div>

Hi all:

## I have the following gems installed

## actionmailer (2.3.8) actionpack (2.3.8) activerecord (2.3.8) activerecord-sqlserver-adapter (2.3.8) activeresource (2.3.8) activesupport (2.3.8) dbi (0.4.3) deprecated (3.0.0) rack (1.1.0) rails (2.3.8) rake (0.8.7) rubygems-update (1.3.7) shoesgem (0.1469.0)

## whenever I run a program with:

require ‘rubygems’  
require ‘active\_record’  
require ‘active\_support’  
require ‘yaml’  
…

## I receive a warning:

## WARNING: YAML.add\_builtin\_type is not implemented

any clues?

Thank you in advance…

---

<div class="post-metadata">

**Author:** ![michbukana](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/4af34b/32.png) [@michbukana](https://www.ruby-forum.com/u/michbukana)\
**Post date:** [July 21, 2010, 6:37pm UTC](https://www.ruby-forum.com/t/warning-yaml-add-builtin-type-is-not-implemented/191875/2 "2010-07-21T18:37:58Z")

</div>

This just means that something is calling add\_builtin\_type for wich we  
don’t have implementation yet.

Tomas

---

<div class="post-metadata">

**Author:** ![michbukana](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/4af34b/32.png) [@michbukana](https://www.ruby-forum.com/u/michbukana)\
**Post date:** [July 22, 2010, 3:04am UTC](https://www.ruby-forum.com/t/warning-yaml-add-builtin-type-is-not-implemented/191875/3 "2010-07-22T03:04:11Z")

</div>

Tomas M. wrote:

> This just means that something is calling add\_builtin\_type for wich we  
> don’t have implementation yet.
> 
> Tomas

I know, fortunately it is just a warning, however,  
I’m just speaking of standard gems,  
That warning appears just after I execute the requires I’m mentioning.

Thank you in advance,

Eduardo