I encounter this error:
/home/zhiy/.rvm/gems/ruby-1.9.3-p545/gems/therubyracer-0.12.1/lib/v8/weak.rb:14:in `require': cannot load such file -- ref (LoadError)
from /home/zhiy/.rvm/gems/ruby-1.9.3-p545/gems/therubyracer-0.12.1/lib/v8/weak.rb:14:in `<module:Weak>'
from /home/zhiy/.rvm/gems/ruby-1.9.3-p545/gems/therubyracer-0.12.1/lib/v8/weak.rb:2:in `<module:V8>'
from /home/zhiy/.rvm/gems/ruby-1.9.3-p545/gems/therubyracer-0.12.1/lib/v8/weak.rb:1:in `<top (required)>'
from /home/zhiy/.rvm/gems/ruby-1.9.3-p545/gems/therubyracer-0.12.1/lib/v8.rb:3:in `require'
from /home/zhiy/.rvm/gems/ruby-1.9.3-p545/gems/therubyracer-0.12.1/lib/v8.rb:3:in `<top (required)>'
from /home/zhiy/.rvm/gems/ruby-1.9.3-p545/gems/therubyracer-0.12.1/lib/therubyracer.rb:1:in `require'
from /home/zhiy/.rvm/gems/ruby-1.9.3-p545/gems/therubyracer-0.12.1/lib/therubyracer.rb:1:in `<top (required)>'
from /home/zhiy/.rvm/gems/ruby-1.9.3-p545/gems/bundler-1.6.2/lib/bundler/runtime.rb:76:in `require'
from /home/zhiy/.rvm/gems/ruby-1.9.3-p545/gems/bundler-1.6.2/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
from /home/zhiy/.rvm/gems/ruby-1.9.3-p545/gems/bundler-1.6.2/lib/bundler/runtime.rb:72:in `each'
from /home/zhiy/.rvm/gems/ruby-1.9.3-p545/gems/bundler-1.6.2/lib/bundler/runtime.rb:72:in `block in require'
from /home/zhiy/.rvm/gems/ruby-1.9.3-p545/gems/bundler-1.6.2/lib/bundler/runtime.rb:61:in `each'
from /home/zhiy/.rvm/gems/ruby-1.9.3-p545/gems/bundler-1.6.2/lib/bundler/runtime.rb:61:in `require'
from /home/zhiy/.rvm/gems/ruby-1.9.3-p545/gems/bundler-1.6.2/lib/bundler.rb:132:in `require'
from /home/zhiy/work/yottaa/dns/config/application.rb:14:in `<top (required)>'
from /home/zhiy/.rvm/gems/ruby-1.9.3-p545/gems/railties-3.2.13/lib/rails/commands.rb:39:in `require'
from /home/zhiy/.rvm/gems/ruby-1.9.3-p545/gems/railties-3.2.13/lib/rails/commands.rb:39:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
but when I execute require 'ref', it is ok.
can someone help me? Thanks