uninitialized constant ActiveSupport::Dependencies::Mutex

Question

I try to run a working rails project from OSX to Debian. I use on both systems RVM and created the same gemsets and rvmrc for the project. On Debian I installed only ruby with rvm no system installation of ruby exists.

when I jump in the project folder rvm is switching to version 1.8.7 and is using the project gemset everything looks fine.

But when I fire up a rake -T I get this error:

$ rake -T --trace
(in /home/i/project/src)
rake aborted!
uninitialized constant ActiveSupport::Dependencies::Mutex
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rake-0.8.7/lib/rake.rb:2503:in `const_missing'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:55
/home/i/.rvm/rubies/ruby-1.8.7-p249/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
/home/i/.rvm/rubies/ruby-1.8.7-p249/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/activesupport-2.3.5/lib/active_support.rb:56
/home/i/.rvm/rubies/ruby-1.8.7-p249/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
/home/i/.rvm/rubies/ruby-1.8.7-p249/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rails-2.3.5/lib/tasks/misc.rake:18
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rails-2.3.5/lib/tasks/rails.rb:4:in `load'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rails-2.3.5/lib/tasks/rails.rb:4
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rails-2.3.5/lib/tasks/rails.rb:4:in `each'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rails-2.3.5/lib/tasks/rails.rb:4
/home/i/.rvm/rubies/ruby-1.8.7-p249/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
/home/i/.rvm/rubies/ruby-1.8.7-p249/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
/home/i/ws/project/src/Rakefile:10
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rake-0.8.7/lib/rake.rb:2383:in `load'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rake-0.8.7/lib/rake.rb:2383:in `raw_load_rakefile'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rake-0.8.7/lib/rake.rb:2017:in `load_rakefile'
/    home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rake-0.8.7/lib/rake.rb:2016:in `load_rakefile'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rake-0.8.7/lib/rake.rb:2000:in `run'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rake-0.8.7/lib/rake.rb:1998:in `run'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rake-0.8.7/bin/rake:31
/home/i/.rvm/gems/ruby-1.8.7-p249@project/bin/rake:19:in `load'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/bin/rake:19

possible duplicate of [Uninitialized constant ActiveSupport::Dependencies::Mutex (NameError)](http://stackoverflow.com/questions/5176782/uninitialized-constant-activesupportdependenciesmutex-nameerror) — P Shved, Nov 09 '11 at 13:11

score 19 · Answer 1 · edited Jun 29 '11 at 20:37

19

For me, adding require 'thread' didn't work either. The problem was solved by downgrading rubygems to 1.4.2:

It's a compatibility issue between newer versions of rubygems (in my case, 1.8.5) and old versions of rails (in my case 2.3.5)

$ gem install rubygems-update -v='1.4.2'

$ gem uninstall rubygems-update -v='1.8.5'

$ update_rubygems

edited Jun 29 '11 at 20:37

Taryn

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answered Jun 29 '11 at 18:35

Diego Alvarez Correia

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score 13 · Accepted Answer · edited Sep 26 '12 at 07:22

13

My working solution. Add the following line:

require 'thread'

At the first line of Rakefile in your rails project root. And magically all will run ;-)

edited Sep 26 '12 at 07:22

tokland

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answered Apr 14 '11 at 09:27

Dynamick

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score 7 · Answer 3 · answered Apr 06 '11 at 10:32

I ran into this myself not too long ago. If you google for it you'll find a couple of blog and mailing list posts advising you to explicitly require "threads" in your environment.rb. However this did not work for me, but downgrading rubygems did:

sudo gem update --system 1.3.7

Some of the posts also mention upgrading to a newer version of Rails, which was not an option in our case at the moment.

score 0 · Answer 4 · answered Apr 19 '12 at 11:32

0

you can solve it by upgrading rails

gem install rails --version 2.3.11

or downgrade gem

sudo gem update --system 1.5.3

answered Apr 19 '12 at 11:32

zeacuss

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uninitialized constant ActiveSupport::Dependencies::Mutex

4 Answers4