Rails bundle nokogiri -

I am making a first attempt to learn to work with an API and I try to use gem urban I am doing My gem file looks like this

  Source 'https://rubygems.org' # Bundle Rail instead of leading edge: Mani 'Rail', Gitub: 'Rail / Rail' Mani ' Rail ',' 4.2.0.beta2 '# Use the sqlite3 as a database for the active record gem' sqlite3 '# # Use SCSS for the stylesheet Mani' Asus-Rail ',' ~ & gt; 5.0.0. Beta 1 'Use Eugplifier as Compressor for Javascript Properties' Mani' Ugrfire ',' & gt; Use coffee scripts for '1.3.0' # .js.coffee properties and scenes' coffee-rail ',' ~ & gt; 4.0.0 '# more supported runtimes # gem for' thermobraseer 'see https://github.com/sstephenson/execjs#readme, platform :: Ruby # JavaScript library gem' jquery-rails ',' ~ & gt; Use jQuery in; 4.0.0.beta2 '# TurboLines makes quick links in your web application as follows and read: https://github.com/rails/turbolinks gem' turbolinks' # Easily create JSON API and read: https: // github. Com / rails / jbuilder gem 'jbuilder', '~ & gt; 2.0 '# Bundle App Rack Doctor: Dairy / API produces under Rail API; Mani' sdoc ',' ~ & gt; 0.4.0 ', Group :: Doctor Mani' Urban_Edit '# ActiveModel Usage_Share_password # Mani' Beacrpt ',' ~ & gt; Use the Capistrano for deployment # Mani 'Capistano-Rail', Group :: Development Group: Evolution, Test # Anywhere in Call Code. Use the Capistrano for deployment # 3.1.7 '# Unicorn App Servers # Mani as Unicon' Prevent 'debugger' execution and get debugger console gem 'bibbug' Access an IRB console on #exception pages or & lt;% = console% & gt; 'Web-Console', '~ & gt; 2.0.0.beta4 '# increases the speed of the speed by walking in the backdrop of your background and read: https://github.com/rails/spring Mani' spring 'end  

The bundle is returning the following error and I am trying to find a solution:

https: //rubygems.org / .......... ... fixing dependency ... could not bundler gem "nakogiri" Find compatible versions for: Jempha In L: urban _ (priority = 0) depends on Rabbi Nakagiri (~> 1.5.2) Ruby Rail (= 4.2.0.beta 2) depends on Ruby ActionPack (= 4.2.0 .beta2) Ruby Rail Depends on Ruby (~> 2.0) depending on the HTML-sanitizer (> 1.0.1, ~> 1.0) Ruby depends on nose (1.6.3.1)