Rails4.0.0.rc1 exception_notificationエラー ref: http://qiita.com/items/2039bcac71a9b11825b1

file0.txt

rails s
----------
/Users/shu/.rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/activesupport-4.0.0.rc1/lib/active_support/core_ext/class/attribute_accessors.rb:40:in `block in cattr_reader': invalid class attribute name: true (NameError)
----------

file1.txt

gem 'exception_notification', github: 'smartinez87/exception_notification'

file2.txt

AppName::Application.config.middleware.use(
  ExceptionNotifier,
  email_prefix:         "[#{Rails.env}][Site Name] ",
  sender_address:       "xxxxx@gmail.com",
  exception_recipients: ["xxxxx@gmail.com"]
)

file3.txt

  # メール設定
  config.action_mailer.default_url_options   = { host: '0.0.0.0:3000' }
  config.action_mailer.delivery_method       = :smtp
  config.action_mailer.perform_deliveries    = true
  config.action_mailer.raise_delivery_errors = true
  config.action_mailer.smtp_settings         = {
    address:              "smtp.gmail.com",
    port:                 587,
    user_name:            "xxxxx@gmail.com",
    password:             "xxxxxxxxxx",
    authentication:       'plain',
    enable_starttls_auto: true,
  }

file4.txt

    begin
      raise
    rescue Exception => exception
      ExceptionNotifier.notify_exception(exception, env: request.env, data: { msg: "エラーテスト" })
    end

@shu0115 can you solve this problem?