Fatal error: Uncaught Error: Class "Aws\Api\Serializer\RestSerializer" not found in C:\www\api\vendor\aws\aws-sdk-php\src\Api\Serializer\RestJsonSerializer.php:11 Stack trace: #0 {main} thrown in C:\www\api\vendor\aws\aws-sdk-php\src\Api\Serializer\RestJsonSerializer.php on line 11