# Installing gem problem
**URL:** https://rubytalk.org/t/installing-gem-problem/63228
**Category:** ruby-talk
**Created:** [2 August 2011 12:23 UTC](https://rubytalk.org/t/installing-gem-problem/63228 "2011-08-02T12:23:18Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@amir\_e](https://rubytalk.org/u/amir_e)
#### Post date: [2 August 2011 12:23 UTC](https://rubytalk.org/t/installing-gem-problem/63228/1 "2011-08-02T12:23:18Z")
Hi
when I want to install feed tools gem I face a problem . I take a
picture and attach it to this post, please see it and solve my problem.
thanks
Attachments:
[http://www.ruby-forum.com/attachment/6485/ASDASDD.PNG](http://www.ruby-forum.com/attachment/6485/ASDASDD.PNG)
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### Author:  [@Steve\_Klabnik](https://rubytalk.org/u/Steve_Klabnik)
#### Post date: [2 August 2011 14:10 UTC](https://rubytalk.org/t/installing-gem-problem/63228/2 "2011-08-02T14:10:57Z")
Did you try 'gem install builder'?
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### Author:  [@amir\_e](https://rubytalk.org/u/amir_e)
#### Post date: [2 August 2011 21:55 UTC](https://rubytalk.org/t/installing-gem-problem/63228/3 "2011-08-02T21:55:45Z")
Unfortunately after installing builder ,again Command Prompt give me
that message.
please help me.
thanks
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### Author:  [@amir\_e](https://rubytalk.org/u/amir_e)
#### Post date: [3 August 2011 12:43 UTC](https://rubytalk.org/t/installing-gem-problem/63228/4 "2011-08-03T12:43:40Z")
I am beginner in ruby and I use ruby 1.9.2 in windows 7. I have a
problem with installing gems.for example : 1 - when I typed gem install
RedCloth , command prompt give this error:
" ERROR: Error Installing RedCloth: invalid gem format for
C:/Ruby192/lib/ruby/gems/1.9.1/cache/RedCloth-4.2.7-x86-mingw32.gem "
2 - and when I typed gem install hpricot command prompt give me this
error :
" ERROR: Error Installing hpricot: The 'hpricot' native gem requires
installed build tools. Please update your PATH to include build tools or
download the DevKit from '[http://rubyinstaller.org/downloads](http://rubyinstaller.org/downloads)' and follow
the instructions at
'[http://github.com/oneclick/rubyinstaller/wiki/Development-Kit](http://github.com/oneclick/rubyinstaller/wiki/Development-Kit)' "
please help me to solve this problem. Special thanks
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### Author:  [@Justin\_Collins](https://rubytalk.org/u/Justin_Collins)
#### Post date: [2 August 2011 23:16 UTC](https://rubytalk.org/t/installing-gem-problem/63228/5 "2011-08-02T23:16:58Z")
What is the output from running "gem sources" ? Are you able to ping the sources listed?
-Justin
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> On 08/02/2011 02:55 PM, amir e. wrote:
>
> > Unfortunately after installing builder ,again Command Prompt give me
> > that message.
> > please help me.
> > thanks