title: how to debug Minification failed. Returning unminified contents
body: <p>I am using Asp.net MVC 4 bundler to bundle and minify my Css files.</p>
  
  <p>YSlow is showing this error below</p>
  
  <pre><code> /* Minification failed. Returning unminified contents.
      (1442,26): run-time error CSS1019: Unexpected token, found ':'
      (1442,26): run-time error CSS1042: Expected function, found ':'
      (1442,26): run-time error CSS1062: Expected semicolon or closing curly-brace, found ':'
       */
  </code></pre>
  
  <p>This is my bundle code,</p>
  
  <pre><code>    bundles.Add(new StyleBundle("~/Content/css").Include(
          "~/Content/site.css",
          "~/Content/fullcalendar.css",
          "~/Content/jquery.dropdown.css",
          "~/Content/jquery.tagit.css",
          "~/Content/tipsy.css"
          ));
  </code></pre>
  
  <p>Now how will i find out which css file is causing the problem ? How can i debug to find the line that is causing the problem ? site.css is the only css file that i wrote.</p>