Installing gem problem

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

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Posted via http://www.ruby-forum.com/.

Did you try 'gem install builder'?

Unfortunately after installing builder ,again Command Prompt give me
that message.
please help me.
thanks

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Posted via http://www.ruby-forum.com/.

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' and follow
the instructions at
'http://github.com/oneclick/rubyinstaller/wiki/Development-Kit' "

please help me to solve this problem. Special thanks

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Posted via http://www.ruby-forum.com/.

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