There was an error while trying to load the gem 'sass-rails'. (Bundler::GemRequireError)
<p>I am getting an error while starting rails server.</p>

<pre><code>C:\Ruby22-x64\WebAppRails&gt;rails s C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:80:in `rescue in block (2 levels) in require': There was an error while trying to load the gem 'sass-rails'. (Bundler::GemRequireError)
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:72:in `each'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:72:in `block in require'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:61:in `each'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:61:in `require'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler.rb:99:in `require'
        from C:/Ruby22-x64/WebAppRails/config/application.rb:7:in `&lt;top (required)&gt;'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:78:in `require'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:78:in `block in server'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:75:in `tap'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:75:in `server'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.6/lib/rails/commands.rb:17:in `&lt;top (required)&gt;'
        from bin/rails:4:in `require'
        from bin/rails:4:in `&lt;main&gt;'
</code></pre>

<p>Here are the gems I'm using:</p>

<pre><code>C:\Ruby22-x64\WebAppRails&gt;bundle show
</code></pre>

<p>Gems included by the bundle:</p>

<ul>
<li>actionmailer (4.2.6)</li>
<li>actionpack (4.2.6)</li>
<li>actionview (4.2.6)</li>
<li>activejob (4.2.6)</li>
<li>activemodel (4.2.6)</li>
<li>activerecord (4.2.6)</li>
<li>activesupport (4.2.6)</li>
<li>arel (6.0.3)</li>
<li>binding_of_caller (0.7.2)</li>
<li>builder (3.2.2)</li>
<li>bundler (1.11.2)</li>
<li>byebug (8.2.5)</li>
<li>coffee-rails (4.1.1)</li>
<li>coffee-script (2.4.1)</li>
<li>coffee-script-source (1.10.0)</li>
<li>concurrent-ruby (1.0.1)</li>
<li>debug_inspector (0.0.2)</li>
<li>erubis (2.7.0)</li>
<li>execjs (2.6.0)</li>
<li>globalid (0.3.6)</li>
<li>i18n (0.7.0)</li>
<li>jbuilder (2.4.1)</li>
<li>jquery-rails (4.1.1)</li>
<li>json (1.8.3)</li>
<li>loofah (2.0.3)</li>
<li>mail (2.6.4)</li>
<li>mime-types (3.0)</li>
<li>mime-types-data (3.2016.0221)</li>
<li>mini_portile2 (2.0.0)</li>
<li>minitest (5.8.4)</li>
<li>multi_json (1.11.3)</li>
<li>nokogiri (1.6.7.2)</li>
<li>rack (1.6.4)</li>
<li>rack-test (0.6.3)</li>
<li>rails (4.2.6)</li>
<li>rails-deprecated_sanitizer (1.0.3)</li>
<li>rails-dom-testing (1.0.7)</li>
<li>rails-html-sanitizer (1.0.3)</li>
<li>railties (4.2.6)</li>
<li>rake (11.1.2)</li>
<li>rdoc (4.2.2)</li>
<li>sass (3.4.22)</li>
<li>sass-rails (5.0.4)</li>
<li>sdoc (0.4.1)</li>
<li>sprockets (3.6.0)</li>
<li>sprockets-rails (3.0.4)</li>
<li>sqlite3 (1.3.11)</li>
<li>thor (0.19.1)</li>
<li>thread_safe (0.3.5)</li>
<li>tilt (2.0.2)</li>
<li>turbolinks (2.5.3)</li>
<li>tzinfo (1.2.2)</li>
<li>tzinfo-data (1.2016.4)</li>
<li>uglifier (3.0.0)</li>
<li>web-console (2.3.0)</li>
</ul>

<p>gem version is 2.4.5.1 and ruby version is 2.2.4</p>

<p>What do I need to do to fix this?</p>