cannot load such file -- thin (LoadError) while running rackup private_pub.ru -s thin -E production command

Question

I am referring to the pub railscast tutorial and have followed all steps properly but while running last command i.e.

rackup private_pub.ru -s thin -E production

to rackup the faye server I am getting following error:

/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- thin (LoadError)
from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from /var/lib/gems/1.9.1/gems/rack-1.5.2/lib/rack/handler/thin.rb:1:in `<top (required)>'
from /var/lib/gems/1.9.1/gems/rack-1.5.2/lib/rack/handler.rb:20:in `const_get'
from /var/lib/gems/1.9.1/gems/rack-1.5.2/lib/rack/handler.rb:20:in `block in get'
from /var/lib/gems/1.9.1/gems/rack-1.5.2/lib/rack/handler.rb:20:in `each'
from /var/lib/gems/1.9.1/gems/rack-1.5.2/lib/rack/handler.rb:20:in `inject'
from /var/lib/gems/1.9.1/gems/rack-1.5.2/lib/rack/handler.rb:20:in `get'
from /var/lib/gems/1.9.1/gems/rack-1.5.2/lib/rack/server.rb:268:in `server'
from /var/lib/gems/1.9.1/gems/rack-1.5.2/lib/rack/server.rb:264:in `start'
from /var/lib/gems/1.9.1/gems/rack-1.5.2/lib/rack/server.rb:141:in `start'
from /var/lib/gems/1.9.1/gems/rack-1.5.2/bin/rackup:4:in `<top (required)>'
from /usr/local/bin/rackup:19:in `load'

Sunglasses

Have you already installed thin (using gem install thin, or via bundler and the Gemfile)? – Toil

Ran into same issue rack only supports thin and not puma? – Consumptive

Answer 1

Have you already installed thin?

You can install a gem using the gem command: gem install thin

Or alternatively use Bundler, add thin to the Gemfile then run bundle install (of course you will need the bundler gem for this)

Toil

This answer should have been accepted; seems to have solved the problem. – Wellman

Answer 2

Had same problem: Here is how you fix it. Go into your current rails directory type the following: 1. sudo gem install faye, 2. sudo gem install thin.

The chances are you didn't install it local to your new rails project.

Marthena