title: Minification failed. Returning unminified contents
body: <p>I have made my first website using MVC 5 which works fine on my local machine but when I publish it to the server some of the CSS is not minifying correctly.</p>
  
  <pre><code>    /* Minification failed. Returning unminified contents.
      (80,1): run-time error CSS1019: Unexpected token, found '@import'
      (80,9): run-time error CSS1019: Unexpected token, found 'url('../Content/dark-skin/skin.css')'
      (671,16): run-time error CSS1062: Expected semicolon or closing curly-brace, found ':'
      (1288,16): run-time error CSS1062: Expected semicolon or closing curly-brace, found ':'
      (1680,1): run-time error CSS1019: Unexpected token, found '@keyframes'
      (1682,5): run-time error CSS1062: Expected semicolon or closing curly-brace, found '50%'
      (1685,1): run-time error CSS1019: Unexpected token, found '@-webkit-keyframes'
      (1687,5): run-time error CSS1062: Expected semicolon or closing curly-brace, found '50%'
       */
      /* NUGET: BEGIN LICENSE TEXT
       *
       * Microsoft grants you the right to use these script files for the sole
       * purpose of either: (i) interacting through your browser with the Microsoft
       * website or online service, subject to the applicable licensing or use
       * terms; or (ii) using the files as included with a Microsoft product subject
       * to that product's license terms. Microsoft reserves all other rights to the
       * files not expressly granted by Microsoft, whether by implication, estoppel
       * or otherwise. The notices and licenses below are for informational purposes only.
       *
       * NUGET: END LICENSE TEXT */
      /*!
       * Bootstrap v3.0.0
       *
       * Copyright 2013 Twitter, Inc
       * Licensed under the Apache License v2.0
       * http://www.apache.org/licenses/LICENSE-2.0
       *
       * Designed and built with all the love in the world by @mdo and @fat.
       *//*! normalize.css v2.1.0 | MIT License | git.io/normalize */
  </code></pre>
  
  <p>After trying to correct some of the errors and publishing again the error looks the same. </p>
  
  <p>The strangest part is with <code>bootstrap.css</code> which I have slightly modified for the purpose of the website. When I publish it the changes are not in the bundle file. Is it possible that bootstrap is loaded from Bootstrap server and not my project? </p>
  
  <pre class="lang-cs prettyprint-override"><code>    bundles.Add(new StyleBundle("~/Content/cssmain").Include(
                        "~/Content/bootstrap.css",
                        "~/Content/site.css",
                        "~/Content/ilightbox.css",
                        "~/Content/bannerscollection_zoominout.css"));
  </code></pre>
  
  <p>I have also tried to do minification myself using web application but my changes are not visible and the files do not appear to be minified.</p>
  
  <p>Any help is appreciated. </p>