Fatal error: Uncaught Error: Interface "Illuminate\Contracts\Mail\Mailable" not found in D:\xampp\htdocs\dropifypro\vendor\laravel\framework\src\Illuminate\Mail\Mailable.php:29 Stack trace: #0 {main} thrown in D:\xampp\htdocs\dropifypro\vendor\laravel\framework\src\Illuminate\Mail\Mailable.php on line 29