Fatal error: Uncaught Error: Class 'Zend\Validator\Hostname' not found in /var/www/html/vendor/zendframework/zend-http/src/PhpEnvironment/Request.php:281 Stack trace: #0 /var/www/html/vendor/zendframework/zend-http/src/PhpEnvironment/Request.php(86): Zend\Http\PhpEnvironment\Request->setServer(Object(Zend\Stdlib\Parameters)) #1 /var/www/html/lib/internal/Magento/Framework/HTTP/PhpEnvironment/Request.php(130): Zend\Http\PhpEnvironment\Request->__construct() #2 /var/www/html/lib/internal/Magento/Framework/App/Request/Http.php(115): Magento\Framework\HTTP\PhpEnvironment\Request->__construct(Object(Magento\Framework\Stdlib\Cookie\PhpCookieReader), Object(Magento\Framework\Stdlib\StringUtils), NULL) #3 /var/www/html/lib/internal/Magento/Framework/ObjectManager/Factory/AbstractFactory.php(93): Magento\Framework\App\Request\Http->__construct(Object(Magento\Framework\Stdlib\Cookie\PhpCookieReader), Object(Magento\Framework\Stdlib\StringUtils), Object(Magento\Framework\App\Route\ConfigInterface\Proxy), Object(Magento\Backend\App\R in /var/www/html/vendor/zendframework/zend-http/src/PhpEnvironment/Request.php on line 281