を使用して Rails サーバーを起動すると 、次のrails s
エラーが発生します。
/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
どうすれば修正できますか?