ruby-on-rails-3 – 错误Errno :: ECONNRESET：由对等体重新连接

gem 'rails','3.0.0'
gem 'devise'
gem 'bson_ext','>= 1.0.7'
gem 'bson','>= 1.0.7'
gem 'mongo_mapper',:branch => 'rails3',:git => 'http://github.com/jnunemaker/mongomapper.git'
gem 'devise-mongo_mapper',:git => 'git://github.com/collectiveidea/devise-mongo_mapper'

使用上述设置,我会收到以下请求错误：

Started GET "/users/sign_out" for 127.0.0.1 at 2010-09-27 13:16:30 +0300
  Processing by Devise::SessionsController#destroy as HTML
Redirected to http://localhost:3000/
Completed 302 Found in 19ms
[2010-09-27 13:16:31] ERROR Errno::ECONNRESET: Connection reset by peer
    /usr/local/ruby/lib/ruby/1.9.1/webrick/httpserver.rb:56:in `eof?'
    /usr/local/ruby/lib/ruby/1.9.1/webrick/httpserver.rb:56:in `run'
    /usr/local/ruby/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread'


Started GET "/users/edit" for 127.0.0.1 at 2010-09-27 13:16:35 +0300
  Processing by Devise::RegistrationsController#edit as HTML
Completed   in 16ms
[2010-09-27 13:16:35] ERROR Errno::ECONNRESET: Connection reset by peer
    /usr/local/ruby/lib/ruby/1.9.1/webrick/httpserver.rb:56:in `eof?'
    /usr/local/ruby/lib/ruby/1.9.1/webrick/httpserver.rb:56:in `run'
    /usr/local/ruby/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread'

用户型号：

class User
  include MongoMapper::Document
  plugin MongoMapper::Devise
  devise :registerable,:database_authenticatable,:recoverable
end

想法？