我想安装RailsAdmin gem。当我运行bundle install时，我得到：
Bundler could not find compatible versions for gem "jquery-ui-rails":
In Gemfile:
jquery-ui-sass-rails was resolved to 4.0.3.0, which depends on
jquery-ui-rails (= 4.0.3)
rails_admin was resolved to 0.6.4, which depends on
jquery-ui-rails (~> 5.0) Bundler could not find compatible versions for gem "rails": In Gemfile:
rails (= 4.2.4)
rails_admin was resolved to 0.0.1, which depends on
rails (~> 3.1) Bundler could not find compatible versions for gem "sass-rails": In Gemfile:
sass-rails (~> 5.0)
rails_admin was resolved to 0.6.1, which depends on
sass-rails (~> 4.0)
我尝试删除Gemfile.lock并重新bundle install，但它不起作用。
这是我的Gemfile：
source 'https://rubygems.org'
gem 'rails', '4.2.4'
gem 'mysql2', '~> 0.3.18'
gem 'sass-rails', '~> 5.0'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.1.0'
gem 'therubyracer', platforms: :ruby
gem 'jquery-rails'
gem 'fancybox2-rails'
gem "select2-rails"
gem 'jquery-ui-sass-rails'
gem 'momentjs-rails', '~> 2.10.2'
gem 'turbolinks'
gem 'jbuilder', '~> 2.0'
gem 'sdoc', '~> 0.4.0', group: :doc
gem 'bootstrap-sass', '~> 3.3.6'
gem 'bootstrap-material-design'
gem 'geocoder'
gem 'gmaps4rails'
gem 'chewy'
gem "font-awesome-rails"
gem 'cells'
gem 'cells-erb'
gem 'rails-i18n'
gem 'devise'
gem 'omniauth-twitter'
gem 'omniauth-facebook'
gem 'koala'
gem 'rails_admin'
gem 'rmagick'
gem 'carrierwave'
gem 'fog'
gem 'htmlentities'
#editor
gem "wysiwyg-rails"
gem 'pundit', github: 'elabs/pundit'
group :development, :test do
# Call 'byebug' anywhere in the code to stop execution and get a debugger console
gem 'byebug'
end
group :development do
# Access an IRB console on exception pages or by using <%= console %> in views
gem 'web-console', '~> 2.0'
# Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
gem 'spring'
end
我的Ruby和Rails版本是：
* Ruby 2.1.4p265 (2014-10-27 revision 48166) [i686-linux]
* Rails 4.2.4
如何修复这些错误？