最近我已经更新到rails 4.0.0.rc1并且我遇到了一些错误。我目前也在使用RVM。在创建rails 4应用程序并运行'rails s'或'rspec rails'后，我收到了错误 -
/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>'
我已经尝试重新加载rvm，清理并修复它，但我仍然遇到同样的错误。我能帮忙解决一下吗？
提前致谢：）
答案 0 :(得分：3)
有同样的问题。出于某种原因，我不知道它是通过运行来解决的：
gem install json -v 1.7.7
答案 1 :(得分：0)