Unable to resolve Ruby error (missing psych)

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Whenever I run something with Ruby on my server, I get the following error:

/usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/yaml.rb:56:in `<top (required)>':
It seems your ruby installation is missing psych (for YAML output).
To eliminate this warning, please install libyaml and reinstall your ruby.

I installed Ruby using RVM onto my VPS.

I’ve tried installing the package libyaml as per instructed in other issues on Stack Overflow, to no avail.

I’m not sure what type of system my VPS is running, but it doesn’t have the apt-get command. It does have yum…

Organicism answered 14/10, 2012 at 12:27 Comment(0)

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I had this problem and installing libyaml didn't help. It turned out that libyaml-devel was needed by psych. I was on centos6 so I did this:

curl -O http://www6.atomicorp.com/channels/atomic/centos/6/x86_64/RPMS/atomic-release-1.0-14.el6.art.noarch.rpm

sudo  rpm -Uvh atomic-release-1.0-14.el6.art.noarch.rpm

sudo yum install libyaml-devel

rvm reinstall 1.9.3-p194

Sunward answered 16/10, 2012 at 16:13 Comment(9)

When I run sudo rpm -Uvh atomic-release-1.0-14.el6.art.noarch.rpm, I get:

warning: atomic-release-1.0-14.el6.art.noarch.rpm: Header V3 DSA signature: NOKEY, key ID 5ebd2744 error: Failed dependencies: 	rpmlib(FileDigests) <= 4.6.0-1 is needed by atomic-release-1.0-14.el6.art.noarch 	rpmlib(PayloadIsXz) <= 5.2-1 is needed by atomic-release-1.0-14.el6.art.noarch

– Organicism 16/10, 2012 at 16:14

What OS? Could you run in a shell: uname -a and post the output here please – Sunward 18/10, 2012 at 11:16

If it is Fedora you are running, search rpm.pbone.net for: libyaml-devel fedora rpm - for your version. For example, Fedora 16 x86_64 will take you here rpm.pbone.net/index.php3/stat/4/idpl/17341900/dir/fedora_16/com/…. – Sunward 18/10, 2012 at 11:22

Linux server9987 2.6.32-042stab049.6 #1 SMP Mon Feb 6 19:17:43 MSK 2012 i686 i686 i386 GNU/Linux – Organicism 18/10, 2012 at 15:2

ok - so its openvz server. Maybe I should not have pointed to the x86_64 repo. sorry. Seems you can get libyaml-devel for i386 in this repo: www6.atomicorp.com/channels/atomic/redhat/6/i386/RPMS/… . – Sunward 18/10, 2012 at 15:18

Running the above commands with that repo instead gives me exactly the same error as before (see above comment). Sorry if I seem like a n00b. Appreciate your guidance. – Organicism 18/10, 2012 at 19:36

You have errors of unresolved dependencies that don't appear on my system - try to install those dependencies it asks for: FileDigests and PayloadIsXz. I have no idea what they are. If succeed, then install libyaml-devel, and then reinstall ruby. I just searched for libyaml-devel openvz and found some a link that suggests: wget packages.sw.be/rpmforge-release/… -- then -- rpm -ivh rpmforge-release-0.5.2-2.el5.rf.i386.rpm -- then -- yum install libyaml-devel ... sorry I can't try any of this out. – Sunward 22/10, 2012 at 17:48

Ran the commands you mentioned at the end of your comment and then reinstalled Ruby: rvm reinstall 1.9.3. Sorted! Thank you very, very much. – Organicism 23/10, 2012 at 16:20

Complete installation process (CentOS 6.3, Ruby) gist.github.com/denispeplin/5011950 – Hushhush 22/2, 2013 at 9:24

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I have to disagree with @JunaidKirkire in that I think you are running CentOS or Redhat 5 which uses a a very old version of Ruby by default and I think using RVM is a much better way to go. I believe you will just need to compile libyaml from source with the following:

rvm pkg install libyaml

This will tell you the directory that it is compiling into, in my case, it is /Users/ehowe/.rvm/usr

You then need to recompile Ruby with the following option:

rvm reinstall 1.9.3 --with-libyaml-dir=$directory_that_rvm_installed_libyaml_to

So in my case, I would do:

rvm install 1.9.3 --with-libyaml-dir=/Users/ehowe/.rvm/usr

If you are running rvm as root, this will get installed into /usr/local/rvm/usr. If you are running it as a user, as is recommended, it would be /home/$user/.rvm/usr

Rein answered 14/10, 2012 at 13:58 Comment(8)

Does this look correct: rvm reinstall 1.9.3 --with-libyaml-dir=/usr/local/rvm/src/yaml-0.1.4. Or would it just be? rvm reinstall 1.9.3 --with-libyaml-dir=/usr/local/rvm? – Organicism 15/10, 2012 at 21:52

After running rvm pkg install libyaml and then rvm reinstall 1.9.3 --with-libyaml-dir=/usr/local/rvm/src/yaml-0.1.4, I am still getting the psych warning. – Organicism 15/10, 2012 at 21:59

You should just use /usr/local/rvm/usr as the path.I tested this and it worked. – Rein 16/10, 2012 at 1:35

Are you absolutely sure you used the correct path? I tested this on a clean CentOS 5.8 install and it worked for me. Can you try it again and send me a gist with the complete output from start to finish? – Rein 18/10, 2012 at 12:33

hastebin.com/mewexusidu.vbs — example of the error immediately after reinstalling at the bottom. – Organicism 18/10, 2012 at 15:12

Thank you! Solved my problem: serverfault.com/questions/442150/… – Leucoplast 25/10, 2012 at 8:8

Sorted my problem on CentOS 6.3 using --with-libyaml-dir=/home/$user/.rvm/usr. Thanks! – Schwa 26/10, 2012 at 13:18

I had same issue on Ubuntu and this solved it for me. Many other suggestions did not work. Thanks! – Manson 14/11, 2012 at 1:55

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I had this problem and installing libyaml didn't help. It turned out that libyaml-devel was needed by psych. I was on centos6 so I did this:

curl -O http://www6.atomicorp.com/channels/atomic/centos/6/x86_64/RPMS/atomic-release-1.0-14.el6.art.noarch.rpm

sudo  rpm -Uvh atomic-release-1.0-14.el6.art.noarch.rpm

sudo yum install libyaml-devel

rvm reinstall 1.9.3-p194

Sunward answered 16/10, 2012 at 16:13 Comment(9)

When I run sudo rpm -Uvh atomic-release-1.0-14.el6.art.noarch.rpm, I get:

warning: atomic-release-1.0-14.el6.art.noarch.rpm: Header V3 DSA signature: NOKEY, key ID 5ebd2744 error: Failed dependencies: 	rpmlib(FileDigests) <= 4.6.0-1 is needed by atomic-release-1.0-14.el6.art.noarch 	rpmlib(PayloadIsXz) <= 5.2-1 is needed by atomic-release-1.0-14.el6.art.noarch