Why do I get "Could not find 'railties' error with Rails server?

Question

When I start my Rails server using rails s, I getting this error:

/usr/local/lib/site_ruby/1.8/rubygems/dependency.rb:296:in `to_specs': Could not find 'railties' (>= 0) among 10 total gem(s) (Gem::LoadError)
from /usr/local/lib/site_ruby/1.8/rubygems/dependency.rb:307:in `to_spec'
from /usr/local/lib/site_ruby/1.8/rubygems/core_ext/kernel_gem.rb:47:in `gem'
from /usr/bin/rails:22

How do I fix it?

Answer 1

There might be something wrong with your rails install. Try gem list, if you don't see railties then re-install rails: gem install rails

Answer 2

Do you have more than one version of ruby on your machine? If so download rvm, use rvm --default to set a default ruby version, then check if you have all the needed dependencies (i.e. gems) associated with your default version of ruby. If not, then reinstall rails and the missing gems.

Answer 3

If you install a new gem don't forget to bundle install and start your server again.

Answer 4

I'm not sure, but you have to try re-install Rails.

Try sudo gem install rails.

Answer 5

Try:

bundle install

Then start your server with this command:

bundle exec rails s