我是Rails的新手。我想使用bootstrap，所以我把'bootstrap-sass'放在我的Gemfile中的文档中，如下所示：
group :assets do
gem 'sass-rails', '~> 3.2.3'
gem 'coffee-rails', '~> 3.2.1'
gem 'uglifier', '>= 1.0.3'
gem 'bootstrap-sass', '~> 2.3.1.0'
end
我尝试使用'bundle install'安装它，这给了我以下错误消息：
Fetching gem metadata from https,//rubygems.org/"...........
Unfortunately, a fatal error has occurred. Please see the Bundler troubleshooting documentation at
http://bit.ly/bundler-issues. Thanks!
/usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/config_file.rb:195:in `merge': can't convert String into Hash (TypeError)
from /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/config_file.rb:195:in `initialize'
from /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems.rb:364:in `new'
from /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems.rb:364:in `configuration'
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/lib/bundler/rubygems_integration.rb:34:in `configuration'
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/lib/bundler/rubygems_integration.rb:53:in `sources='
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/lib/bundler/source/rubygems.rb:249:in `remote_specs'
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/lib/bundler/source/rubygems.rb:162:in `fetch_specs'
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/lib/bundler/source/rubygems.rb:66:in `specs'
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/lib/bundler/definition.rb:192:in `block (2 levels) in index'
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/lib/bundler/definition.rb:189:in `each'
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/lib/bundler/definition.rb:189:in `block in index'
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/lib/bundler/index.rb:9:in `build'
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/lib/bundler/definition.rb:185:in `index'
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/lib/bundler/definition.rb:179:in `resolve'
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/lib/bundler/definition.rb:114:in `specs'
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/lib/bundler/definition.rb:109:in `resolve_remotely!'
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/lib/bundler/installer.rb:83:in `run'
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/lib/bundler/installer.rb:14:in `install'
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/lib/bundler/cli.rb:247:in `install'
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/lib/bundler/vendor/thor/task.rb:27:in `run'
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/lib/bundler/vendor/thor/invocation.rb:120:in `invoke_task'
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/lib/bundler/vendor/thor.rb:344:in `dispatch'
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/lib/bundler/vendor/thor/base.rb:434:in `start'
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/bin/bundle:20:in `block in <top (required)>'
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/lib/bundler/friendly_errors.rb:3:in `with_friendly_errors'
from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.4/bin/bundle:20:in `<top (required)>'
from /usr/local/rvm/gems/ruby-1.9.3-p392/bin/bundle:19:in `load'
from /usr/local/rvm/gems/ruby-1.9.3-p392/bin/bundle:19:in `<main>'
from /usr/local/rvm/gems/ruby-1.9.3-p392/bin/ruby_noexec_wrapper:14:in `eval'
from /usr/local/rvm/gems/ruby-1.9.3-p392/bin/ruby_noexec_wrapper:14:in `<main>'