Fatal error: Uncaught Exception: Mailer driver isn't specified in the application's config in /home/wastudig/ojs/ojs-3.4.0-4/lib/pkp/classes/core/PKPContainer.php:315 Stack trace: #0 /home/wastudig/ojs/ojs-3.4.0-4/lib/pkp/classes/core/PKPContainer.php(268): PKP\core\PKPContainer::getDefaultMailer() #1 /home/wastudig/ojs/ojs-3.4.0-4/lib/pkp/classes/core/PKPContainer.php(117): PKP\core\PKPContainer->loadConfiguration() #2 /home/wastudig/ojs/ojs-3.4.0-4/lib/pkp/classes/core/PKPApplication.php(228): PKP\core\PKPContainer->registerConfiguredProviders() #3 /home/wastudig/ojs/ojs-3.4.0-4/lib/pkp/classes/core/PKPApplication.php(200): PKP\core\PKPApplication->initializeLaravelContainer() #4 /home/wastudig/ojs/ojs-3.4.0-4/classes/core/Application.php(50): PKP\core\PKPApplication->__construct() #5 /home/wastudig/ojs/ojs-3.4.0-4/lib/pkp/includes/bootstrap.php(37): APP\core\Application->__construct() #6 /home/wastudig/ojs/ojs-3.4.0-4/index.php(18): require_once('/home/wastudig/...') #7 {main} thrown in /home/wastudig/ojs/ojs-3.4.0-4/lib/pkp/classes/core/PKPContainer.php on line 315