Issues update 2.0.5.1

Hi,

I’ve issues with YITH Woocommerce Product Add-ons after updating from 2.0.3 to 2.0.5.1. After the update, I get these errors and can’t login to the backend:

Warning: Use of undefined constant YITH_WAPO_SECRET_KEY (in /home/customer/www/teamcentershop.com/public_html/wp-content/plugins/yith-woocommerce-product-add-ons/includes/classes/class.yith-wccl-admin.php on line 261

Warning: cannot modify header information – headers already sent by (output started at/home/customer/www/teamcentershop.com/public_html/wp-content/plugins/yith-woocommerce-product-add-ons/includes/classes/class.yith-wccl-admin.php:261) in /home/customer/www/teamcentershop.com/public_html/wp-includes/pluggable.php on line 1340.

By the way, I’ve set the plugin back to version 2.0.3 for the moment so the website is still accessible.

Thanks in advance for helping me fixing this!

Best regards,

Job

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