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Editorial Team
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Asked: 2026-05-16T04:50:32+00:00

When I try to run even simple rails commands such as: rails -h I

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When I try to run even simple rails commands such as:

rails -h

I get a popup error after a few seconds that says:

ruby.exe – Unable To Locate Component

This application has failed to start
because msvcrt-ruby18.dll was not
found. Re-installing the application
may fix the problem.

I am running:

  • Windows XP (yes I know I should attempt ruby on a Windows machine).
  • Ruby 1.9.1p378 [i386-mingw32].
  • Have updated all my gems to latest versions (as of 14-July-2010).

Is there a way I can test what is making this error? Does anyone know what it could mean?

I have found that in my ruby19/bin folder there is msvcrt-ruby191.dll but there is no msvcrt-ruby18.dll anywhere. Why would it be looking for this anyway if I’m using ruby 1.9?

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1 Answer

  1. Editorial Team

    The current release version 1.1.5 of Mongrel is incompatible with Ruby 1.9 and throws this error when it is run. It’s easy to solve – just make sure Rubygems is up-to-date:

    gem update --system

    Then install the new pre-release version of Mongrel:

    gem install mongrel --pre

    Alternatively, if this isn’t caused by Mongrel, you can try installing the DevKit, then try this:

    gem install *gemname* --platform=ruby

    This forces compilation of the extension from source using DevKit and works with most of the major gems I’ve tried.

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