Fatal error: Uncaught Error: Call to undefined function env() in /home/airbuahc/public_html/website-subscription-management-system/vendor/laravel/framework/config/concurrency.php:18 Stack trace: #0 {main} thrown in /home/airbuahc/public_html/website-subscription-management-system/vendor/laravel/framework/config/concurrency.php on line 18