Unable to resolve Ruby error (missing psych)

Question

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 `

        

Answer 1

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

Answer 2

In case people still hit this, I fixed it using the new autolibs feature in RVM, which automatically installs dependencies using your homebrew libraries (check out rvm help autolibs for info.)

rvm reinstall 1.9.3 --autolibs=2

Answer 3

The problem could be solved by installing libyaml. Below are the corresponding packages for the most popular distributions:

• Fedora libyaml
• Ubuntu and other Debian based libyaml-dev
• Some other like CentOS libyaml-devel

and also you should install the following to avoid similar problems in future:

ruby-devel libxml2 libxml2-devel libxslt libxslt-devel

Answer 4

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

Answer 5

I had this same libyaml issue with CentOS 6.2

Doing...

rvm pkg install libyaml
rvm reinstall 1.9.3 --with-libyaml-dir=/usr/local/rvm/usr

Fixed it for me.

(thanks to @Eugene)

Answer 6

You seem to be working on Fedora. Check the official Ruby website for instructions on installing on Fedora.

Try this link too http://sraji.wordpress.com/2011/01/25/how-to-install-ruby-on-fedora-14/