title: Shows Error - failed to extend when a class is extended in SASS
body: <pre><code>.class{
    color:#333;
  }
  
  .ex-class{
   @extend .class;
  }
  </code></pre>
  
  <p>Shows error:</p>
  
  <blockquote>
    <p>".ex-class" failed to extend ".class"<br>
    The selector ".class" was not found.<br>
    This will be an error in future releases of Sass<br>
    Use "@extend .class !optional" if the extend should be able to fail  </p>
  </blockquote>
  
  <hr>
  
  <p>What makes me in trouble, Sass is compiled fine on all other git Repos on my system, I tried by changing the Sass versions, My team member works fine with this Sass and same version.</p>