Fatal error: Uncaught Error: Call to undefined function env() in C:\xampp\htdocs\Restaurant-0.3.1\vendor\laravel\nexmo-notification-channel\config\vonage.php:16 Stack trace: #0 {main} thrown in C:\xampp\htdocs\Restaurant-0.3.1\vendor\laravel\nexmo-notification-channel\config\vonage.php on line 16