[Plugin: vSlider] Can’t find WP_Http class

When entering vSlider Setup, the following message pops up in the php error log : Class ‘WP_Http’ not found.

The solution is simply to add:

require_once ABSPATH.'/wp-includes/class-http.php';

Before the first instantiation of WP_Http.

Cheers !

http://wordpress.org/extend/plugins/vslider/