Ruby on rails 更新到4.0.0.rc1后rails出现错误

最近我更新了rails 4.0.0.rc1，并且遇到了一些错误。我目前也在使用RVM。创建rails 4应用程序并运行“rails s”或“rspec rails”后，我遇到了错误-

/Users/metaHunts/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-1.7.7/lib/json/common.rb:67:in `initialize': no implicit conversion of nil into Hash (TypeError)
from /Users/metaHunts/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-1.7.7/lib/json/common.rb:67:in `new'
from /Users/metaHunts/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-1.7.7/lib/json/common.rb:67:in `generator='
from /Users/metaHunts/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-1.7.7/lib/json/ext.rb:17:in `<module:Ext>'
from /Users/metaHunts/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-1.7.7/lib/json/ext.rb:12:in `<module:JSON>'
from /Users/metaHunts/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-1.7.7/lib/json/ext.rb:9:in `<top (required)>'
from /Users/metaHunts/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-1.7.7/lib/json.rb:58:in `require'
from /Users/metaHunts/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-1.7.7/lib/json.rb:58:in `<module:JSON>'
from /Users/metaHunts/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-1.7.7/lib/json.rb:54:in `<top (required)>'
from /Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/activesupport-4.0.0.rc1/lib/active_support/core_ext/object/to_json.rb:3:in `require'
from /Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/activesupport-4.0.0.rc1/lib/active_support/core_ext/object/to_json.rb:3:in `<top (required)>'
from /Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/activesupport-4.0.0.rc1/lib/active_support/core_ext/object.rb:11:in `require'
from /Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/activesupport-4.0.0.rc1/lib/active_support/core_ext/object.rb:11:in `<top (required)>'
from /Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/configuration.rb:3:in `require'
from /Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/configuration.rb:3:in `<top (required)>'
from /Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/railtie.rb:2:in `require'
from /Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/railtie.rb:2:in `<top (required)>'
from /Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/engine.rb:1:in `require'
from /Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/engine.rb:1:in `<top (required)>'
from /Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/application.rb:4:in `require'
from /Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/application.rb:4:in `<top (required)>'
from /Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails.rb:9:in `require'
from /Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails.rb:9:in `<top (required)>'
from /Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/activerecord-4.0.0.rc1/lib/active_record/railtie.rb:2:in `require'
from /Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/activerecord-4.0.0.rc1/lib/active_record/railtie.rb:2:in `<top (required)>'
from /Users/metaHunts/Desktop/TeenStarter/config/application.rb:4:in `require'
from /Users/metaHunts/Desktop/TeenStarter/config/application.rb:4:in `<top (required)>'
from /Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/commands.rb:78:in `require'
from /Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/commands.rb:78:in `block in <top (required)>'
from /Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/commands.rb:75:in `tap'
from /Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/commands.rb:75:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'

/Users/metaHunts/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-1.7.7/lib/json/common.rb:67:在“初始化”中：没有将nil隐式转换为哈希（TypeError）
from/Users/metaHunts/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-1.7.7/lib/json/common.rb:67:in“new”
from/Users/metaHunts/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-1.7.7/lib/json/common.rb:67:in`generator=>
from/Users/metaHunts/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-1.7.7/lib/json/ext.rb:17:in`'
来自/Users/metaHunts/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-1.7.7/lib/json/ext.rb:12:in`'
来自/Users/metaHunts/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-1.7.7/lib/json/ext.rb:9:in`'
from/Users/metaHunts/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-1.7.7/lib/json.rb:58:in“require”
来自/Users/metaHunts/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-1.7.7/lib/json.rb:58:in`'
from/Users/metaHunts/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/gems/2.0.0/gems/json-1.7.7/lib/json.rb:54:in`'
从/Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/activesupport-4.0.0.rc1/lib/active\u support/core\u ext/object/to_json.rb:3:在'require'中
从/Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/activesupport-4.0.0.rc1/lib/active\u support/core\u ext/object/to_json.rb:3:in`'
来自/Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/activesupport-4.0.0.rc1/lib/active\u support/core\u ext/object.rb:11:in'require'
来自/Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/activesupport-4.0.0.rc1/lib/active\u support/core\u ext/object.rb:11:in`'
from/Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/configuration.rb:3:in'require'
来自/Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/configuration.rb:3:in`'
from/Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/railtie.rb:2:in'require'
from/Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/railtie.rb:2:in`'
from/Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/engine.rb:1:in'require'
来自/Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/engine.rb:1:in`'
from/Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/application.rb:4:in'require'
来自/Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/application.rb:4:in`'
from/Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails.rb:9:in'require'
from/Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails.rb:9:in`'
from/Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/activerecord-4.0.0.rc1/lib/active_record/railtie.rb:2:in'require'
from/Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/activerecord-4.0.0.rc1/lib/active\u record/railtie.rb:2:in`'
from/Users/metaHunts/Desktop/TeenStarter/config/application.rb:4:in'require'
从/Users/metaHunts/Desktop/TeenStarter/config/application.rb:4:in`'
from/Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/commands.rb:78:in'require'
from/Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/commands.rb:78:in'block-in'
from/Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/commands.rb:75:in'tap'
来自/Users/metaHunts/.rvm/gems/ruby-2.0.0-p0/gems/railties-4.0.0.rc1/lib/rails/commands.rb:75:in`'
从箱子/轨道：4:in“require”
从箱子/轨道：4:in`'

我曾尝试重新加载rvm，清理和修复它，但我一直得到相同的错误。能帮我修一下吗

---

提前感谢：）

通过使用

rvm implode

---

在使用rvm网站上的命令重新安装之前（）

也有同样的问题。出于某种原因，我不知道它通过运行得到了修复：

gem install json -v 1.7.7