Fatal error: Uncaught Error: Class "Aws\Api\Serializer\QueryParamBuilder" not found in /home/wilpf/public_html/pms/vendor/aws/aws-sdk-php/src/Api/Serializer/Ec2ParamBuilder.php:10 Stack trace: #0 {main} thrown in /home/wilpf/public_html/pms/vendor/aws/aws-sdk-php/src/Api/Serializer/Ec2ParamBuilder.php on line 10