Fatal error: Uncaught Error: Interface 'Magento\SalesRule\Api\CouponRepositoryInterface' not found in /home/esecureh/public_html/magdemo/vendor/magento/module-sales-rule/Model/CouponRepository.php:18 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-sales-rule/Model/CouponRepository.php on line 18