创建新的Rails项目并运行rails -v时出错

Question

我是Rails的新手，每次尝试创建新项目时，似乎都会收到此错误。 是否有人对我需要如何处理此错误消息有任何见解？ 运行“ rails -v”时出现相同的错误

/Users/buckleyjosh/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/dependency.rb:298:in `to_specs': Could not find 'json' (~> 1.4) among 137 total gem(s) (Gem::LoadError)
from /Users/buckleyjosh/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/specification.rb:1271:in `block in activate_dependencies'
from /Users/buckleyjosh/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/specification.rb:1260:in `each'
from /Users/buckleyjosh/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/specification.rb:1260:in `activate_dependencies'
from /Users/buckleyjosh/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/specification.rb:1242:in `activate'
from /Users/buckleyjosh/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/specification.rb:1274:in `block in activate_dependencies'
from /Users/buckleyjosh/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/specification.rb:1260:in `each'
from /Users/buckleyjosh/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/specification.rb:1260:in `activate_dependencies'
from /Users/buckleyjosh/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/specification.rb:1242:in `activate'
from /Users/buckleyjosh/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_gem.rb:48:in `gem'
from /Users/buckleyjosh/.rvm/gems/ruby-1.9.3-p194/bin/rails:18:in `<main>'
from /Users/buckleyjosh/.rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14:in `eval'
from /Users/buckleyjosh/.rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14:in `<main>'

Answer 1

该错误正是它所抱怨的：

Could not find 'json' (~> 1.4) among 137 total gem(s)

在触发任何rails命令之前安装该gem：gem install json

如果您使用的是rvm，请在安装gem之前确保已加载正确版本的ruby。
阅读此宝石的更多信息。