CE Rails 3 branch installation problem

[Steve Harman]

Hello, I am following the instructions at:

https://github.com/bborn/communityengine/blob/rails3/README.markdown

However, I am having a problem with the version of a gem that rails

relies on. It turns out that both community engine and my application 

requires the arel gem but there is a version conflict

Could you please take a look? I would appreciate any help.

[~/Desktop] rails _3.1.3_ new community

      create  

      create  README

      create  Rakefile

      create  config.ru

      create  .gitignore

      create  Gemfile

      create  app

      create  app/assets/images/rails.png

      create  app/assets/javascripts/application.js

      create  app/assets/stylesheets/application.css

      create  app/controllers/application_controller.rb

      create  app/helpers/application_helper.rb

      create  app/mailers

      create  app/models

      create  app/views/layouts/application.html.erb

      create  app/mailers/.gitkeep

      create  app/models/.gitkeep

      create  config

      create  config/routes.rb

      create  config/application.rb

      create  config/environment.rb

      create  config/environments

      create  config/environments/development.rb

      create  config/environments/production.rb

      create  config/environments/test.rb

      create  config/initializers

      create  config/initializers/backtrace_silencers.rb

      create  config/initializers/inflections.rb

      create  config/initializers/mime_types.rb

      create  config/initializers/secret_token.rb

      create  config/initializers/session_store.rb

      create  config/initializers/wrap_parameters.rb

      create  config/locales

      create  config/locales/en.yml

      create  config/boot.rb

      create  config/database.yml

      create  db

      create  db/seeds.rb

      create  doc

      create  doc/README_FOR_APP

      create  lib

      create  lib/tasks

      create  lib/tasks/.gitkeep

      create  lib/assets

      create  lib/assets/.gitkeep

      create  log

      create  log/.gitkeep

      create  public

      create  public/404.html

      create  public/422.html

      create  public/500.html

      create  public/favicon.ico

      create  public/index.html

      create  public/robots.txt

      create  script

      create  script/rails

      create  test/fixtures

      create  test/fixtures/.gitkeep

      create  test/functional

      create  test/functional/.gitkeep

      create  test/integration

      create  test/integration/.gitkeep

      create  test/unit

      create  test/unit/.gitkeep

      create  test/performance/browsing_test.rb

      create  test/test_helper.rb

      create  tmp/cache

      create  tmp/cache/assets

      create  vendor/assets/stylesheets

      create  vendor/assets/stylesheets/.gitkeep

      create  vendor/plugins

      create  vendor/plugins/.gitkeep

         run  bundle install

Fetching source index for http://rubygems.org/

Using rake (0.9.2.2) 

Using multi_json (1.3.6) 

Using activesupport (3.1.3) 

Using builder (3.0.0) 

Using i18n (0.6.0) 

Using activemodel (3.1.3) 

Using erubis (2.7.0) 

Using rack (1.3.6) 

Using rack-cache (1.2) 

Using rack-mount (0.8.3) 

Using rack-test (0.6.1) 

Using hike (1.2.1) 

Using tilt (1.3.3) 

Using sprockets (2.0.4) 

Using actionpack (3.1.3) 

Using mime-types (1.19) 

Using polyglot (0.3.3) 

Using treetop (1.4.10) 

Using mail (2.3.3) 

Using actionmailer (3.1.3) 

Using arel (2.2.3) 

Using tzinfo (0.3.33) 

Using activerecord (3.1.3) 

Using activeresource (3.1.3) 

Using ansi (1.4.3) 

Using bundler (1.0.22) 

Using coffee-script-source (1.3.3) 

Using execjs (1.4.0) 

Using coffee-script (2.2.0) 

Using rack-ssl (1.3.2) 

Using json (1.7.3) 

Using rdoc (3.12) 

Using thor (0.14.6) 

Using railties (3.1.3) 

Using coffee-rails (3.1.1) 

Using jquery-rails (1.0.19) 

Using rails (3.1.3) 

Using sass (3.1.20) 

Using sass-rails (3.1.6) 

Using sqlite3 (1.3.6) 

Using turn (0.8.3) 

Using uglifier (1.2.6) 

Your bundle is complete! Use `bundle show [gemname]` to see where a bundled gem is installed.

[~/Desktop] cd community               

[~/Desktop/community] bundle install             

Fetching source index for http://rubygems.org/

Bundler could not find compatible versions for gem "arel":

  In snapshot (Gemfile.lock):

    arel (2.2.3)

  In Gemfile:

    community_engine (~> 2.0.0.beta3) ruby depends on

      arel (= 2.2.1) ruby

Running `bundle update` will rebuild your snapshot from scratch, using only

the gems in your Gemfile, which may resolve the conflict.

[~/Desktop/community]