Fatal error: Uncaught Error: Class "Illuminate\Mail\Mailable" not found in C:\xampp\htdocs\satisfaction-survey-main\app\Mail\SurveyInvitationMail.php:15 Stack trace: #0 {main} thrown in C:\xampp\htdocs\satisfaction-survey-main\app\Mail\SurveyInvitationMail.php on line 15