How to Solve "Ruby Installation Is Missing Psych" Error

how to solve ruby installation is missing psych error?

In my case

rvm pkg install libyaml

and

rvm reinstall ruby-1.9.3-p125

solved the problem.

For people using Ubuntu, make sure that libtool is installed prior to the steps above:

sudo apt-get install libtool

For macOS users (with homebrew):

rm -rf /usr/local/lib/ruby/gems/ && brew reinstall ruby

Fixing the ruby installation is missing psych error?

I had same problem after installing ruby 1.9.3 with rvm.
I solve it by downloading yaml-0.1.4.tar.gz into ~/.rvm/archives and then reinstalled ruby again.

cd ~/.rvm/archives
wget http://pyyaml.org/download/libyaml/yaml-0.1.4.tar.gz
rvm reinstall 1.9.3 

If you get some compileerrors, try with this instead

rvm reinstall 1.9.3 --with-gcc=clang

Unable to resolve Ruby error (missing psych)

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

Ruby on Rails. gem error cant find installation

I think you need to install node js as there is a dependency on the run time, that helpfully does not show up.

Please find a link: Rake aborted, Error while trying to load the gem 'uglifier'

where they suggest apt-get install nodejs

Please install libyaml and reinstall your ruby

First remove any previous docs of yaml by

cd .rvm/src
sudo rm -rf yaml*

Then you can do rest of the install by -

rvm pkg install libyaml

P.S You will need to reinstall ruby after this.

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UPDATE: If rvm pkg seems to be deprecated. You can compile a source on your own. All you
gotta do is download the latest version of libyaml from http://pyyaml.org/download/libyaml/

tar zxf yaml-0.1.4.tar.gz
cd yaml-0.1.4
./configure
make
make install

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UPDATE2: BTW, you could still use rvm pkg and/or when reinstalling ruby make sure to enbale autolibs by
\curl -L https://get.rvm.io | bash -s stable --rails --autolibs=enable

Ruby Installation on Ubuntu is really messed up

Try installing RVM.

Not sure if this helps:

http://www.andrehonsberg.com/article/install-rvm-ubuntu-1204-linux-for-ruby-193
http://mattslay.com/installing-rails-on-ubuntu-12-04-with-rvm-support/

Last time I used Ubuntu (2007) - it was the same, OSX doesn't make it much easier, but RVM takes most of the issues away.

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