Fatal error: Uncaught Error: Class 'Aws\Crypto\MaterialsProvider' not found in /var/www/html/vendor/aws/aws-sdk-php/src/Crypto/KmsMaterialsProvider.php:9 Stack trace: #0 {main} thrown in /var/www/html/vendor/aws/aws-sdk-php/src/Crypto/KmsMaterialsProvider.php on line 9