Fatal error: Uncaught Error: Interface "Aws\Signature\SignatureInterface" not found in C:\xampp\htdocs\uploadPdf\vendor\aws\aws-sdk-php\src\Signature\SignatureV4.php:21 Stack trace: #0 {main} thrown in C:\xampp\htdocs\uploadPdf\vendor\aws\aws-sdk-php\src\Signature\SignatureV4.php on line 21