Fatal error: Uncaught Error: Interface "Aws\Crypto\MaterialsProviderInterfaceV3" not found in C:\WebServer\htdocs\bookshelf\vendor\aws\aws-sdk-php\src\Crypto\MaterialsProviderV3.php:6 Stack trace: #0 {main} thrown in C:\WebServer\htdocs\bookshelf\vendor\aws\aws-sdk-php\src\Crypto\MaterialsProviderV3.php on line 6