there I have just uploaded the events plugin and have just

Hi there I have just uploaded the events plugin and have just started to use it. I am trying to edit events but when i press "update" button this is the error message i get
"Fatal error: Class 'MP_Product' not found in /home/content/92/13951392/html/iwd/wp-content/plugins/events-and-bookings/lib/plugins/lib/class_eab_mp_bridge.php on line 493" can anyone help? am i doing something wrong?