# Upgrade 1.9 then Missing an installed Rails gem?

**URL:** <https://www.ruby-forum.com/t/upgrade-1-9-then-missing-an-installed-rails-gem/180007>\
**Category:** Ruby\
**Created:** [December 9, 2009, 4:31pm UTC](https://www.ruby-forum.com/t/upgrade-1-9-then-missing-an-installed-rails-gem/180007 "2009-12-09T16:31:22Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![artchrst](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/e36b37/32.png) [@artchrst](https://www.ruby-forum.com/u/artchrst)\
**Post date:** [December 9, 2009, 4:31pm UTC](https://www.ruby-forum.com/t/upgrade-1-9-then-missing-an-installed-rails-gem/180007/1 "2009-12-09T16:31:22Z")

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Hi Guys,

I’ve installed both ruby 1.8 and 1.9.

When I run a newly created rails app, it keep asking me to install 2.3.5  
rails.

However, I’ve installed it. Moreover, after I uninstall and re-install,  
the problems still exists.

Here is my console log:

arthur:~/workspace/test/test2$ ruby script/server  
Missing the Rails 2.3.5 gem. Please `gem install -v=2.3.5 rails`, update  
your RAILS\_GEM\_VERSION setting in config/environment.rb for the Rails  
version you do have installed, or comment out RAILS\_GEM\_VERSION to use  
the latest version installed.  
arthur:~/workspace/test/test2$ gem list

\*\*\* LOCAL GEMS \*\*\*

actionmailer (2.3.5)  
actionpack (2.3.5)  
activerecord (2.3.5)  
activeresource (2.3.5)  
activesupport (2.3.5)  
authlogic (2.1.3)  
authlogic-oid (1.0.4)  
capistrano (2.5.10)  
chronic (0.2.3)  
daemons (1.0.10)  
eventmachine (0.12.10)  
facebooker (1.0.55)  
geokit (1.5.0)  
gettext (2.1.0)  
gettext\_activerecord (2.1.0)  
gettext\_rails (2.1.0)  
highline (1.5.1)  
hoe (2.3.3)  
json (1.2.0)  
json\_pure (1.2.0)  
locale (2.0.5)  
locale\_rails (2.0.5)  
mail (1.3.0)  
mime-types (1.16)  
mysql (2.8.1)  
net-scp (1.0.2)  
net-sftp (2.0.4)  
net-ssh (2.0.16)  
net-ssh-gateway (1.0.1)  
polyglot (0.2.9)  
rack (1.0.1)  
rails (2.3.5)  
rake (0.8.7)  
ruby-openid (2.1.7)  
rubyforge (2.0.3)  
rubygems-update (1.3.5)  
thin (1.2.5)  
tlsmail (0.0.1)  
treetop (1.4.2)

Thanks!  
Arthur

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<div class="post-metadata">

**Author:** ![artchrst](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/e36b37/32.png) [@artchrst](https://www.ruby-forum.com/u/artchrst)\
**Post date:** [December 9, 2009, 4:36pm UTC](https://www.ruby-forum.com/t/upgrade-1-9-then-missing-an-installed-rails-gem/180007/2 "2009-12-09T16:36:40Z")

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Arthur C. wrote:

> arthur:~/workspace/test/test2$ gem list

ruby 1.8 and 1.9 will have their own entirely separate installations of  
gems.

So “gem list” is probably the 1.8 gem command. You need to run the other  
gem command for 1.9: maybe “gem19 list” or “/opt/ruby19/bin/gem list”,  
or wherever you installed ruby 1.9 to (remembering that you have to  
install rubygems for ruby 1.9 as well)

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<div class="post-metadata">

**Author:** ![artchrst](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/e36b37/32.png) [@artchrst](https://www.ruby-forum.com/u/artchrst)\
**Post date:** [December 10, 2009, 2:52am UTC](https://www.ruby-forum.com/t/upgrade-1-9-then-missing-an-installed-rails-gem/180007/3 "2009-12-10T02:52:34Z")

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Brian C. wrote:

> Arthur C. wrote:
> 
> > arthur:~/workspace/test/test2$ gem list
> 
> ruby 1.8 and 1.9 will have their own entirely separate installations of  
> gems.
> 
> So “gem list” is probably the 1.8 gem command. You need to run the other  
> gem command for 1.9: maybe “gem19 list” or “/opt/ruby19/bin/gem list”,  
> or wherever you installed ruby 1.9 to (remembering that you have to  
> install rubygems for ruby 1.9 as well)

Hi Brian,

Thanks for your help.

I’ve removed the whole rubygems and reinstall it using 1.9.

It works now! (of course, I am not sure if ruby 1.8’s gem still  
works…)

Arthur