Deprecated: strtolower(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/lib/pkp/classes/core/PKPContainer.php on line 214
Fatal error: Uncaught Exception: Mailer driver isn't specified in the application's config in /var/www/html/lib/pkp/classes/core/PKPContainer.php:324
Stack trace:
#0 /var/www/html/lib/pkp/classes/core/PKPContainer.php(275): PKP\core\PKPContainer::getDefaultMailer()
#1 /var/www/html/lib/pkp/classes/core/PKPContainer.php(122): PKP\core\PKPContainer->loadConfiguration()
#2 /var/www/html/lib/pkp/classes/core/PKPApplication.php(228): PKP\core\PKPContainer->registerConfiguredProviders()
#3 /var/www/html/lib/pkp/classes/core/PKPApplication.php(200): PKP\core\PKPApplication->initializeLaravelContainer()
#4 /var/www/html/classes/core/Application.php(50): PKP\core\PKPApplication->__construct()
#5 /var/www/html/lib/pkp/includes/bootstrap.php(37): APP\core\Application->__construct()
#6 /var/www/html/index.php(18): require_once('/var/www/html/l...')
#7 {main}
thrown in /var/www/html/lib/pkp/classes/core/PKPContainer.php on line 324