# Rail's compatibility problem

**URL:** <https://www.ruby-forum.com/t/rails-compatibility-problem/159477>\
**Category:** Rails\
**Created:** [February 4, 2009, 10:18pm UTC](https://www.ruby-forum.com/t/rails-compatibility-problem/159477 "2009-02-04T22:18:34Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![dscaffold](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/f0a364/32.png) [@dscaffold](https://www.ruby-forum.com/u/dscaffold)\
**Post date:** [February 4, 2009, 10:18pm UTC](https://www.ruby-forum.com/t/rails-compatibility-problem/159477/1 "2009-02-04T22:18:34Z")

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Hello:  
I did ‘Jruby script/generate controller home index’, and I got “Rails  
requires RubyGems \>= 1.3.1 (you have 1.2.0). Please ‘gem update  
–system’ and try again” message. I follwed, and did ‘gem update  
–system’, but it tells me there is nothing to update. My rails version  
is 2.2.2, I tried to install lower version, but did ‘gem query --remote  
–name-matches rails’, only rails 2.2.2 version comes up, which is the  
one I am having. Thank you very much.

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**Author:** ![dscaffold](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/f0a364/32.png) [@dscaffold](https://www.ruby-forum.com/u/dscaffold)\
**Post date:** [February 4, 2009, 10:50pm UTC](https://www.ruby-forum.com/t/rails-compatibility-problem/159477/2 "2009-02-04T22:50:26Z")

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On 4 Feb 2009, at 21:18, Jack Wu wrote:

> one I am having. Thank you very much.  
> rubygems 1.2 and 1.1 can have problems updating themselves (  
> [http://blog.segment7.net/articles/2008/11/13/rubygems-1-3-1](http://blog.segment7.net/articles/2008/11/13/rubygems-1-3-1)  
> )

Fred

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**Author:** ![dscaffold](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/f0a364/32.png) [@dscaffold](https://www.ruby-forum.com/u/dscaffold)\
**Post date:** [February 5, 2009, 1:23am UTC](https://www.ruby-forum.com/t/rails-compatibility-problem/159477/3 "2009-02-05T01:23:24Z")

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Is it because you have jruby AND ruby? Therefore also two gems?

Blog: [http://random8.zenunit.com/](http://random8.zenunit.com/)  
Learn rails: [http://sensei.zenunit.com/](http://sensei.zenunit.com/)

On 05/02/2009, at 8:18 AM, Jack Wu [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)