title: Sass::SyntaxError: Undefined mixin 'transition'
body: <p>I am getting error </p>
  
  <blockquote>
    <p>Sass::SyntaxError: Undefined mixin 'transition'
     while doing assets pre-compile.</p>
  </blockquote>
  
  <p>I have following things in my code:</p>
  
  <p><strong>application.css.scss</strong></p>
  
  <pre><code>/*
   *= require_tree .
   *= require_self
   */
  </code></pre>
  
  <p><strong>custom.css.scss</strong></p>
  
  <pre><code>@import "bootstrap";
  @import "bootstrap-sprockets";
  
  @import "font-awesome";
  @import "font-awesome-sprockets";
  </code></pre>
  
  <p>Please let me know in case I am doing anything wrong here.</p>