Fatal error: Uncaught Error: Interface "Magento\Framework\Event\ObserverInterface" not found in /home/airtimer/public_html/vendor/amzn/amazon-pay-module/Observer/KlarnaKcoOverride.php:31 Stack trace: #0 {main} thrown in /home/airtimer/public_html/vendor/amzn/amazon-pay-module/Observer/KlarnaKcoOverride.php on line 31