wp 4.6.1,

wp 4.6.1, coursepress Pro 1.3.4.3 (everything else latest versions as well)

We have setup a course, and used a Mollie key to set payments in the store. Now everything is as it should up till the second last page in paying for the course. Error is below..Site should have gone live this week ... can you explain?

page: http://dev.evolveyourlife.nl/store/checkout/confirm/?order_id=86bfa4af3928

Notice: Undefined variable: timestamp in /home/evolve_adm/public_html/wp-content/plugins/marketpress/includes/common/payment-gateways/mollie.php on line 197

Fatal error: MP_Gateway_Mollie::process_confirm_order(): The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition "MP_Cart" of the object you are trying to operate on was loaded _before_ unserialize() gets called or provide a __autoload() function to load the class definition in /home/evolve_adm/public_html/wp-content/plugins/marketpress/includes/common/payment-gateways/mollie.php on line 199