Fatal error: Uncaught Error: Class 'Zend\Loader\PluginClassLoader' not found in /home/appilogicx/public_html/marketing/vendor/zendframework/zend-mail/src/Header/HeaderLoader.php:15 Stack trace: #0 {main} thrown in /home/appilogicx/public_html/marketing/vendor/zendframework/zend-mail/src/Header/HeaderLoader.php on line 15