# Rails app seems to be 'requiring' a gem 'automatically'

**URL:** <https://www.ruby-forum.com/t/rails-app-seems-to-be-requiring-a-gem-automatically/181336>\
**Category:** Rails\
**Created:** [January 10, 2010, 12:36am UTC](https://www.ruby-forum.com/t/rails-app-seems-to-be-requiring-a-gem-automatically/181336 "2010-01-10T00:36:20Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![pitosalas](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a4c791/32.png) [@pitosalas](https://www.ruby-forum.com/u/pitosalas)\
**Post date:** [January 10, 2010, 12:36am UTC](https://www.ruby-forum.com/t/rails-app-seems-to-be-requiring-a-gem-automatically/181336/1 "2010-01-10T00:36:20Z")

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I am running the same rails application on two different machines.I have  
done a fresh ‘get’ from the repo into a new directory so I am sure the  
code is exactly the same.

On machine it works fine.

On the other machine, it is behaving as if a certain ‘require’ is  
missing, in particular "require ‘rexml/document’ " But really this  
question isn’t about REXML (at least I don’t think so.)

So it’s something about the environment. Both versions of Ruby and Rails  
are identical. The gem set on each machine is different. Not sure if a  
gem could be causing this but anyway, doing an exhaustive trial and  
error install and remove of gems can’t be the way to go.

Any suggestions on where to look? Or how to troubleshoot?

Where else is there context that could change the bahavior of a rails  
app between two machines in this way?

Thanks for any tips whatsoever!!

Pito S.