Fatal error: Uncaught Error: Interface "Magento\Framework\Event\ObserverInterface" not found in /home/jasainfo/public_html/dev/tests/integration/_files/Magento/TestModuleQuoteTotalsObserver/Observer/AfterCollectTotals.php:13 Stack trace: #0 {main} thrown in /home/jasainfo/public_html/dev/tests/integration/_files/Magento/TestModuleQuoteTotalsObserver/Observer/AfterCollectTotals.php on line 13