Fatal error: Uncaught Error: Class 'Magento\Payment\Observer\AbstractDataAssignObserver' not found in /home/esecureh/public_html/magdemo/vendor/magento/module-vault/Observer/PaymentTokenAssigner.php:16 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-vault/Observer/PaymentTokenAssigner.php on line 16