authorizedpm problem

Hello – after a recent upgrade Orilla Cart (I think) has taken my site down with the fatal error below. Any ideas how to resolve?

http://cardtherapy.co.uk

Fatal error: Class authorizedpm contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (SelfRegisterable::register) in /home/cardther/public_html/wp-content/plugins/authorize-dpm/authorize-dpm.php on line 24

https://ww.wp.xz.cn/plugins/orillacart/