Fatal error: Uncaught Error: Call to undefined function app() in /home/apikharedi/public_html/api/vendor/mll-lab/laravel-graphql-playground/src/routes.php:6 Stack trace: #0 {main} thrown in /home/apikharedi/public_html/api/vendor/mll-lab/laravel-graphql-playground/src/routes.php on line 6