Why doesn't the jquery cookie code work?

Question

JavaScript

Tell me why this code does not work? Even if there is a cookie, the class is not deleted

if (!$.cookie('cookie_name')) {
      $('#msg').addClass('blackZone');
        $.cookie('cookie_name', 'cookie_value', {
      		expires: 5,
      		path: '/',
      });
    } else {
      $('#msg').removeClass('blackZone');
    }

Here is the whole code jsfiddle.net/1Lpdykhx/55