title: Unhandled 'error' event Broken @import declaration
body: <p>Hello I am new to gulpjs and i'm finally getting a hang of it, that is till i got this error while running <strong>gulp --production</strong>:</p>
  
  <pre><code>events.js.:85
      throw er; // Unhandled 'error' event
  Error: Broken @import declaration
  </code></pre>
  
  <p>This is followed by a list of files.
  I do not get this error when i run <strong>gulp</strong> alone.</p>
  
  <p>I traced it to this css file:</p>
  
  <pre><code>/* iCheck plugin skins
  ----------------------------------- */
  @import url("minimal/_all.css");
  /*
  @import url("minimal/minimal.css");
  @import url("minimal/red.css");
  @import url("minimal/green.css");
  @import url("minimal/blue.css");
  @import url("minimal/aero.css");
  @import url("minimal/grey.css");
  @import url("minimal/orange.css");
  @import url("minimal/yellow.css");
  @import url("minimal/pink.css");
  @import url("minimal/purple.css");
  */
  
  @import url("square/_all.css");
  /*
  @import url("square/square.css");
  @import url("square/red.css");
  @import url("square/green.css");
  @import url("square/blue.css");
  @import url("square/aero.css");
  @import url("square/grey.css");
  @import url("square/orange.css");
  @import url("square/yellow.css");
  @import url("square/pink.css");
  @import url("square/purple.css");
  */
  
  @import url("flat/_all.css");
  /*
  @import url("flat/flat.css");
  @import url("flat/red.css");
  @import url("flat/green.css");
  @import url("flat/blue.css");
  @import url("flat/aero.css");
  @import url("flat/grey.css");
  @import url("flat/orange.css");
  @import url("flat/yellow.css");
  @import url("flat/pink.css");
  @import url("flat/purple.css");
  */
  
  @import url("line/_all.css");
  /*
  @import url("line/line.css");
  @import url("line/red.css");
  @import url("line/green.css");
  @import url("line/blue.css");
  @import url("line/aero.css");
  @import url("line/grey.css");
  @import url("line/orange.css");
  @import url("line/yellow.css");
  @import url("line/pink.css");
  @import url("line/purple.css");
  */
  
  @import url("polaris/polaris.css");
  
  @import url("futurico/futurico.css");
  </code></pre>
  
  <p>And i did verify if all the files being imported existed.
  I dunno what is wrong.</p>