Fatal error: Uncaught Error: Class "Aws\Signature\S3SignatureV4" not found in /srv/www/htdocs/moodle/lib/aws-sdk/src/Signature/S3ExpressSignature.php:9 Stack trace: #0 {main} thrown in /srv/www/htdocs/moodle/lib/aws-sdk/src/Signature/S3ExpressSignature.php on line 9