Installation problem

When I try to install the Klopp theme I get the following error “Notice: unserialize(): Error at offset 0 of 28152 bytes in /hermes/bosnaweb28a/b1268/sl.jfoote2/public_html/wp-content/themes/klopp-plus/framework/class.wp-auto-theme-update.php on line 66 Notice: Trying to get property of non-object in /hermes/bosnaweb28a/b1268/sl.jfoote2/public_html/wp-content/themes/klopp-plus/framework/class.wp-auto-theme-update.php on line 69 ”

Please assist