我已经将我的rails项目从4.x升级到5.0.0.beta1以使用actioncable并且我已经按照DHH的例子进行了操作但它无法正常工作.当我启动rails服务器时,它显示错误:
$ rails s
=> Booting Puma
=> Rails 5.0.0.beta1 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
Exiting
/home/laport/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/actioncable-5.0.0.beta1/lib/action_cable/server/configuration.rb:15:in `initialize': uninitialized constant ActionCable::Server::Configuration::ApplicationCable (NameError)
from /home/laport/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/actioncable-5.0.0.beta1/lib/action_cable/server/base.rb:16:in `new'
from /home/laport/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/actioncable-5.0.0.beta1/lib/action_cable/server/base.rb:16:in `block in <class:Base>'
from /home/laport/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/activesupport-5.0.0.beta1/lib/active_support/core_ext/module/attribute_accessors.rb:72:in `block in mattr_reader'
from /home/laport/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/activesupport-5.0.0.beta1/lib/active_support/core_ext/module/attribute_accessors.rb:55:in `each'
from /home/laport/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/activesupport-5.0.0.beta1/lib/active_support/core_ext/module/attribute_accessors.rb:55:in `mattr_reader'
from /home/laport/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/activesupport-5.0.0.beta1/lib/active_support/core_ext/module/attribute_accessors.rb:208:in `mattr_accessor'
from /home/laport/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/actioncable-5.0.0.beta1/lib/action_cable/server/base.rb:16:in `<class:Base>'
from /home/laport/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/actioncable-5.0.0.beta1/lib/action_cable/server/base.rb:12:in `<module:Server>'
from /home/laport/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/actioncable-5.0.0.beta1/lib/action_cable/server/base.rb:7:in `<module:ActionCable>'
from /home/laport/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/actioncable-5.0.0.beta1/lib/action_cable/server/base.rb:6:in `<top (required)>'
from /home/laport/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/actioncable-5.0.0.beta1/lib/action_cable.rb:43:in `server'
from /home/laport/Téléchargements/Nouveau TP/Module_chat (copie)/config/routes.rb:28:in `block …