我刚开始看看rails上的ruby并且无法运行服务器.我正在运行ruby 2.3.0和rails 4.2.5并且在我有一个新的铁路项目之后我尝试运行bin/rails server但是得到以下错误:
Warning: Running `gem pristine --all` to regenerate your installed gemspecs (and deleting then reinstalling your bundle if you use bundle --path) will improve the startup performance of Spring.
/Users/John/.rvm/gems/ruby-head/gems/json-1.8.3/lib/json/ext.rb:13:in `require': incompatible library version - /Users/John/.rvm/gems/ruby-head/gems/json-1.8.3/lib/json/ext/parser.bundle (fatal)
from /Users/John/.rvm/gems/ruby-head/gems/json-1.8.3/lib/json/ext.rb:13:in `<module:Ext>'
from /Users/John/.rvm/gems/ruby-head/gems/json-1.8.3/lib/json/ext.rb:12:in `<module:JSON>'
from /Users/John/.rvm/gems/ruby-head/gems/json-1.8.3/lib/json/ext.rb:9:in `<top (required)>'
from /Users/John/.rvm/gems/ruby-head/gems/json-1.8.3/lib/json.rb:58:in `require'
from /Users/John/.rvm/gems/ruby-head/gems/json-1.8.3/lib/json.rb:58:in `<module:JSON>'
from /Users/John/.rvm/gems/ruby-head/gems/json-1.8.3/lib/json.rb:54:in `<top (required)>'
from /Users/John/.rvm/gems/ruby-head/gems/activesupport-4.2.5/lib/active_support/core_ext/object/json.rb:2:in `require'
from /Users/John/.rvm/gems/ruby-head/gems/activesupport-4.2.5/lib/active_support/core_ext/object/json.rb:2:in `<top (required)>'
from /Users/John/.rvm/gems/ruby-head/gems/activesupport-4.2.5/lib/active_support/core_ext/object.rb:12:in `require'
from /Users/John/.rvm/gems/ruby-head/gems/activesupport-4.2.5/lib/active_support/core_ext/object.rb:12:in `<top (required)>'
from /Users/John/.rvm/gems/ruby-head/gems/railties-4.2.5/lib/rails/configuration.rb:2:in `require'
from …