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Home/ Questions/Q 6119361
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Editorial Team
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Editorial Team
Asked: May 23, 20262026-05-23T15:32:38+00:00 2026-05-23T15:32:38+00:00

I pushed a gem up to rubygems.org, and when I do a ‘gem install

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I pushed a gem up to rubygems.org, and when I do a ‘gem install (gem)’ I get this error:

ERROR:  While executing gem ... (NameError)
uninitialized constant Psych::Syck

I can do a ‘gem build (gem).gemspec’ to generate a local gem and then gem install (gem).gem and that installs fine. I can also put the gem into my Rails’ app’s Gemfile with a pointer to the Github repo and that will also work. I have tried installing the gem (from rubygems.org on multiple computers and they all get the same error.

I am out of ideas as to what can be causing the install to fail when done from rubygems.org but not when I generate it locally. I am using Jeweler to push the gem up to rubygems.org.

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  1. Editorial Team
    Editorial Team
    2026-05-23T15:32:38+00:00Added an answer on May 23, 2026 at 3:32 pm

    Seems to be a problem with Syck. See here:
    Rails 3.1 on Ubuntu 11.04 via RVM – uninitialized constant Psych::Syck

    Here:
    http://rubyforge.org/tracker/?group_id=126&atid=575&func=detail&aid=29163

    And fixes suggested here:
    https://github.com/rubygems/rubygems/pull/57

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