Fatal error: Uncaught Error: Class "Signer" not found in /home/politec/public_html/migracion/seguimiento/vendor/amazonwebservices/aws-sdk-for-php/authentication/signature_v4json.class.php:29 Stack trace: #0 {main} thrown in /home/politec/public_html/migracion/seguimiento/vendor/amazonwebservices/aws-sdk-for-php/authentication/signature_v4json.class.php on line 29