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Editorial Team
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Asked: 2026-05-23T03:53:03+00:00

Why am I getting this error? c:\Ruby192>gem install rails Successfully installed activesupport-3.0.9 Successfully installed

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Why am I getting this error?

c:\Ruby192>gem install rails
Successfully installed activesupport-3.0.9
Successfully installed builder-2.1.2
Successfully installed i18n-0.5.0
Successfully installed activemodel-3.0.9
Successfully installed rack-1.2.3
Successfully installed rack-test-0.5.7
Successfully installed rack-mount-0.6.14
Successfully installed tzinfo-0.3.28
Successfully installed abstract-1.0.0
Successfully installed erubis-2.6.6
Successfully installed actionpack-3.0.9
Successfully installed arel-2.0.10
Successfully installed activerecord-3.0.9
Successfully installed activeresource-3.0.9
Successfully installed mime-types-1.16
Successfully installed polyglot-0.3.1
Successfully installed treetop-1.4.9
Successfully installed mail-2.2.19
Successfully installed actionmailer-3.0.9
Successfully installed thor-0.14.6
Successfully installed rdoc-3.6.1
Successfully installed railties-3.0.9
Successfully installed rails-3.0.9
23 gems installed
Installing ri documentation for activesupport-3.0.9...
Installing ri documentation for builder-2.1.2...
Installing ri documentation for i18n-0.5.0...
Installing ri documentation for activemodel-3.0.9...
Installing ri documentation for rack-1.2.3...
Installing ri documentation for rack-test-0.5.7...
Installing ri documentation for rack-mount-0.6.14...
Installing ri documentation for tzinfo-0.3.28...
Installing ri documentation for abstract-1.0.0...
Installing ri documentation for erubis-2.6.6...
Installing ri documentation for actionpack-3.0.9...
Installing ri documentation for arel-2.0.10...
Installing ri documentation for activerecord-3.0.9...
ERROR:  While executing gem ... (Errno::EINVAL)
    Invalid argument - ./</cdesc-<.ri
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1 Answer

  1. Editorial Team

    Its an error when generating the ri documentation. I run into them from time to time and its nothing to worry about unless you want to use the built in documentation.

    Usually I don’t install the documentation because its available online and there are better resources.
    Try running:

    gem install rails --no-ri --no-rdoc

    That skips the document generation and makes gem installation much faster, it also saves space if you don’t ever use the docs.

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