Fatal error: Uncaught Error: Call to undefined function DI\string() in /var/www/vhosts/awxpokmt.host213.checkdomain.de/htdocs/playground/app/config/container.php:15 Stack trace: #0 {main} thrown in /var/www/vhosts/awxpokmt.host213.checkdomain.de/htdocs/playground/app/config/container.php on line 15