Fatal error: Uncaught Error: Class "Illuminate\Mail\Mailable" not found in C:\xampp\htdocs\uslwmcbil_api\app\Mail\InvAcknowledgementMailSender.php:10 Stack trace: #0 {main} thrown in C:\xampp\htdocs\uslwmcbil_api\app\Mail\InvAcknowledgementMailSender.php on line 10