Plugin broke theme

Mi site http://www.lospaziobianco.it is made on AlYoum theme forest theme http://themeforest.net/item/alyoum-retina-magazine-blog-wordpress-theme/3925878
When activate they break home page before half content where are authors images.

It’s possibile to know why and find a way to make it compatible?

https://wordpress.org/plugins/wp-widget-cache/