Fatal error: Uncaught Error: Class "Aws\Api\Parser\AbstractParser" not found in C:\www\api\vendor\aws\aws-sdk-php\src\S3\ValidateResponseChecksumParser.php:15 Stack trace: #0 {main} thrown in C:\www\api\vendor\aws\aws-sdk-php\src\S3\ValidateResponseChecksumParser.php on line 15