Backup Failed

I have tried to use uppdraftPlus to restore my site but it comes up with an error message when I try to log in. This message reads as follows:

Fatal error: Uncaught Error: Class "Memcache" not found in /homepages/46/d869666050/htdocs/clickandbuilds/Ledicola/wp-content/object-cache.php:849 Stack trace: #0 /homepages/46/d869666050/htdocs/clickandbuilds/Ledicola/wp-content/object-cache.php(82): WP_Object_Cache->__construct() #1 /homepages/46/d869666050/htdocs/clickandbuilds/Ledicola/wp-includes/load.php(729): wp_cache_init() #2 /homepages/46/d869666050/htdocs/clickandbuilds/Ledicola/wp-settings.php(131): wp_start_object_cache() #3 /homepages/46/d869666050/htdocs/clickandbuilds/Ledicola/wp-config.php(103): require_once('/homepages/46/d...') #4 /homepages/46/d869666050/htdocs/clickandbuilds/Ledicola/wp-load.php(50): require_once('/homepages/46/d...') #5 /homepages/46/d869666050/htdocs/clickandbuilds/Ledicola/wp-admin/admin.php(34): require_once('/homepages/46/d...') #6 /homepages/46/d869666050/htdocs/clickandbuilds/Ledicola/wp-admin/options-general.php(10): require_once('/homepages/46/d...') #7 {main} thrown in /homepages/46/d869666050/htdocs/clickandbuilds/Ledicola/wp-content/object-cache.php on line 849

What does this mean and how can it be fixed?

The page I need help with: [log in to see the link]