I cannot get the simple example working

I am not new to Javascript but when I try the example:

<link rel="stylesheet" href="path/to/grapes.min.css">
<script src="path/to/grapes.min.js"></script>
<div id="gjs"></div>
<script type="text/javascript">
  var editor = grapesjs.init({
      container : '#gjs',
      components: '<div class="txt-red">Hello world!</div>',
      style: '.txt-red{color: red}',
  });
</script>

I get a blank page. That is with adding the CSS and Javascript library. Any suggestions on getting this up and running? Looks like an outstanding project!