site unavailable after updates

Hi Guys,

While looking at one of the sites that I admin for a sporting club I noticed a few updates where required and after updating them I was confronted with this

Fatal error: Access level to UB_Blog_Favicons::get_sortable_columns() must be public (as in class WP_List_Table) in /home1/iangill/public_html/wp-content/plugins/ultimate-branding/ultimate-branding-files/modules/favicons/UB_Blog_Favicons.php on line 10

Please advise the best way to fix this

Thanks in advance
Ian