Fatal error: Uncaught Error: Class 'Zend\Server\AbstractServer' not found in /home/app/htdocs/ninja/vendor/zendframework/zend-json/src/Server/Server.php:19 Stack trace: #0 {main} thrown in /home/app/htdocs/ninja/vendor/zendframework/zend-json/src/Server/Server.php on line 19