# Require\_gem is obsolete. Use gem instead

**URL:** <https://www.ruby-forum.com/t/require-gem-is-obsolete-use-gem-instead/92244>\
**Category:** Rails\
**Created:** [April 17, 2007, 12:42pm UTC](https://www.ruby-forum.com/t/require-gem-is-obsolete-use-gem-instead/92244 "2007-04-17T12:42:54Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![spongebob](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/90db22/32.png) [@spongebob](https://www.ruby-forum.com/u/spongebob)\
**Post date:** [April 17, 2007, 12:42pm UTC](https://www.ruby-forum.com/t/require-gem-is-obsolete-use-gem-instead/92244/1 "2007-04-17T12:42:54Z")

</div>

Good Day!

I am using Rails version 1.2.3 and gem version 0.9.2 and I keep  
getting this error:

boot.rb:29:Warning: require\_gem is obsolete. Use gem instead.

Then what I did is I changed “require\_gem” to “gem” coz that’s what I  
read from most websites having the same error… but after that it gave  
me another error:

/usr/lib64/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active\_support/  
dependencies.rb:266:in `load_missing_constant': uninitialized constant ActionMailer (NameError) from /usr/lib64/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:452:in`const\_missing’  
from /usr/lib64/ruby/gems/1.8/gems/activesupport-1.4.2/lib/  
active\_support/dependencies.rb:464:in `const_missing' from /var/www/rails/camfu-old/config/environment.rb:18 from /usr/lib64/ruby/gems/1.8/gems/rails-1.2.3/lib/ initializer.rb:41:in`run’  
from /var/www/rails/camfu-old/config/environment.rb:13  
from /usr/lib64/site\_ruby/1.8/rubygems/custom\_require.rb:27:in  
`gem_original_require' from /usr/lib64/site_ruby/1.8/rubygems/custom_require.rb:27:in`require’  
from /usr/lib64/ruby/gems/1.8/gems/activesupport-1.4.2/lib/  
active\_support/dependencies.rb:495:in `require' ... 23 levels... from /usr/lib64/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/ server.rb:39 from /usr/lib64/site_ruby/1.8/rubygems/custom_require.rb:27:in`gem\_original\_require’  
from /usr/lib64/site\_ruby/1.8/rubygems/custom\_require.rb:27:in  
`require’  
from script/server:3

Has this happened to anyone?  
Any Help would be deeply appreciated. Thank You.

---

<div class="post-metadata">

**Author:** ![spongebob](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/90db22/32.png) [@spongebob](https://www.ruby-forum.com/u/spongebob)\
**Post date:** [April 27, 2007, 3:33pm UTC](https://www.ruby-forum.com/t/require-gem-is-obsolete-use-gem-instead/92244/2 "2007-04-27T15:33:18Z")

</div>

Yes, this is a know issue. If I remember correctly you need to make  
sure you are using the latest version of rake, gems, etc. And update  
your project code by setting the environment.rb to use Rails 1.2.3.

Then execute “rake rails:update” from inside your project. If  
everything is updated properly this warning will go away.