Fatal error: Uncaught Error: Class 'Aws\Signature\S3SignatureV4' not found in /home/xcddwtvp/public_html/aws-sdk-php/Aws/Signature/S3ExpressSignature.php:9 Stack trace: #0 {main} thrown in /home/xcddwtvp/public_html/aws-sdk-php/Aws/Signature/S3ExpressSignature.php on line 9