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Asked: 2026-05-24T17:05:12+00:00

I am getting uninitialized constant YAML::ENGINE when running a rake task from cron since

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I am getting uninitialized constant YAML::ENGINE when running a rake task from cron since I upgraded my server to ruby 1.9.2. I had the same error with the app but putting …

require 'yaml'
YAML::ENGINE.yamler= 'syck'

in the boot.rb file fixed it. If I run the task directly from the command line on my Ubuntu server it works fine, the server uses RVM.

However running a task from cron doesn’t seem to pickup this fix, I have tried this …

task :twitter, :needs => :environment do
  require 'yaml'
  YAML::ENGINE.yamler= 'syck'
  @tweets = Property.updatetwitter
end

to no avail.

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1 Answer

  1. Editorial Team

    Are you sure you’re running it under Ruby 1.9.2? Because while YAML::ENGINE exists in 1.9.2, it’s not in 1.8.7. Check your Ruby version.

    UPDATE

    How to tell which Ruby version program is using from within the program:

    puts `ruby -v`

    Lame way how to enforce cron task to run under certain Ruby version (if server uses RVM):

    rvm use 1.8.7; ...
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