Fatal error: Uncaught Error: Class 'Zend\Diactoros\AbstractSerializer' not found in C:\Apache24\htdocs\vendor.old2\zendframework\zend-diactoros\src\Response\Serializer.php:21 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\vendor.old2\zendframework\zend-diactoros\src\Response\Serializer.php on line 21